Flow5 released to open source

原文

flow5 v7.54, January 1st, 2026

General
- linked flow5 to the Gmsh SDK
- refactored the code to isolate modeler and solver classes into a library
Modelling/Meshing
- all meshing interfaces modified to use the Gmsh library in addition to the built-in custom mesher
- added an option to build fuse meshes conforming to the wings mid-camber line
- removed panel connections at the edges of flaps; slight impact on pitching moment
- removed panel connections between fuselage anbd wings; slight impact on pitching moment
- removed IGES import and export options due to changes of symbol names in the OCC library
- changed the evaluation of inertia properties in the case of an xfl-type fuselage to use OCC instead of the built-in custom evaluator; slight impact on evaluations
- minor improvements to the export of wings to AVL
Analysis
- fixed issues with the velocity parameter in LLT calculations
- removed the option to tilt the wings from AVL controls in linear polars; controls will need to be rebuilt
- added an option to force transitions at hinge location in 2d batch and 3d OTF calculations
Post-processing
- fixed minor issues in the 3d display of LLT results
UI
- bunch of minor improvements and bug fixes
Other
- removed number format localization in the fl5-lib module
- deep code cleaning

flow5 v7.53, January 1st, 2026

General
- flow5 is FOSS
- the format of the .fl5 project file has been modified; NEWLY SAVED FILES WILL NOT BE READABLE BY VERSIONS OLDER THAN v7.53
- set the default OpenGL context to 4.6 instead of 3.3
Modelling/Meshing
- optimized the foil modification routines for faster UI response
- fixed issues with the CAD and STL type sail editors
- fixed the "save as" exit option in the plane editor
Analysis
Post-processing
UI
- fixed more minor compatibility issues with Wayland
Other

flow5 v7.52, September 22, 2025

General
Modelling/Meshing
- fixed AVL-type ctrl issues in T12358 polars
Analysis
- corrected the storage of the local induced drag and induced angle in 3d operating points; was storing and displaying the result of force summations instead of results calculated in the far-field plane
Post-processing
UI
- fixed minor compatibility issues with Wayland in OpenGL views
- minor UI improvements
Other

flow5 v7.51, June 8, 2025

General
- de-activated the requirement for online connection for permanent licences
- upgraded the Windows binary package to Qt 6.8.2 which supports native dark mode
Modelling/Meshing
- fixed AVL-type ctrl issues in T12358 polars
- fixed a crash bug occurring with small triangular panels
Analysis
- fixed the inoperative multithreading when running a plane batch analysis for the first time
Post-processing
- fixed the incorrect export of Cp distributions of boat operating points
UI
Other

flow5 v7.50, February 22, 2025

General
- the format of the .fl5 project file has been modified; NEWLY SAVED FILES WILL NOT BE READABLE BY VERSIONS OLDER THAN v7.50
- moved the file loading operations to a worker thread to enable dynamic feedback
Modelling/Meshing
- simplified the panel bunching method
- fixed occasional meshing failures in the plane editor
Analysis
- moved the T.E. flaps from the plane and foil objects to the polars; check https://flow5.tech/docs/flow5_doc/Modelling/TEFlaps.html for explanations
- modified the calculation of induced drag for triangular method for increased robustness in the handling of flaps; leads to a slight increase in the predicted value
- removed the option to keep results from failed 3d viscous interpolations; this is to prevent mixing of valid an invalid results
- removed the dynamic storage of 3d unit solutions to be compatible with flapped polars; the linear system is now solved at each new calculation
- added the calculation of stability derivatives and root locus modes to T1258 polars
- added AVL type controls to T12358 polars and restored them in T7 polars
- merged the interfaces of T12358 and T7 polars
- added an option to calculate viscous drag on the fly in 3d analyses using XFoil; will become active when flow5 goes open-source
- removed the differential BL analysis method
- added the calculation of the local induced angle to VPW calculations
- moved the viscous loop option to the plane analysis
- added T6 polars to the direct foil module; will become active when flow5 goes open-source
Post-processing
- redesigned the scales interface for the display of operating points in 3d
- fixed a bunch of issues related to the calculation and display of streamlines
- removed the filter option in the polar graphs
UI
- multiple minor improvements to the UI
- fixed some window issues specific to dual screens on linux
Other

flow5 v7.26, May, 2024

General
Modelling/Meshing
Analysis
- fixed minor issues in the plane scripting module
- added the wing's root bending moment to the list of optimization targets
Post-processing
UI
- Fixed some window issues specific to dual screens on linux
Other

flow5 v7.25, April, 2024

General
Modelling/Meshing
- fixed several bugs in the export/import process of sails to xml files; format modified in the case of spline type sails
Analysis
- fixed the inverted angle of beta int the sail module which was accidentally introduced in v7.24 while fixing signs in the plane module
- fixed the issue with the scripted VLM analysis of planes which caused the fuselage panels to be inadvertently included
- added an option in plane and boat scripts to export meshes to STL
Post-processing
UI
Other

flow5 v7.24.1, December 9, 2023

fixed the ineffective saving of graph variables in the application's settings

flow5 v7.24, December 8, 2023

General
- the format of the .fl5 project file has been modified; NEWLY SAVED FILES WILL NOT BE READABLE BY VERSIONS OLDER THAN v7.24
- updated the code for compatibility with Qt6; the binaries are still released with the Qt5 libs for maximum compatibility with all platforms
- added a documentation page on the matter of higher lift predictions in the case of thick surface methods
Modelling/Meshing
- overhaul of the foil modification methods for simplicity and robustness
- improved the construction of the foil's leading edge and of the mid camber line around the L.E.
- improved the module to design and approximate a foil using one spline
- added options to copy wings and fuselage from one plane to another
Analysis
- overhauled and aligned all force, moment and derivative signs :
  - In the output of the non-dimensional stability derivatives, changed the incorrect labels of CLu, CLa and CLq to CZu, CZa and CZq respectively. CLx and CZx have opposite signs since the wind's z_axis is pointing up and the stability's z-axis is pointing down; this has been an opportunity to update the benchmarking against AVL
  - changed the output of lateral moment coefficients Cl and Cn to be in wind axes instead of body axes
  - fixed the inverted sign of beta in T6 polars; now consistent with T5 polars, with the convention used in AVL and with the 3d view display; existing polars will need to be recalculated;
  - fixed a bug which caused the body panels to be occasionally ignored in the calculation of moments
  - corrected a bug in the display of the 1/4 chord pitching moment in the operating point view in the case of triangle methods
  - this has been an opportunity to clarify axes and moment conventions used in flow5
- added the "Closed_Inner_Side" field to the wing's xml definition file
- various improvements and bug fixes to the plane optimization module
- fixed a crash bug in the 2d foil optimization module
Post-processing
- added an option to change all graph variables in one action in the plane polar and operating point views; the option is located in the screen's bottom right container
UI
- fixed view updates in the floating 3d view
- fixed a crash bug when deleting a foil in the operating point view
- fixed a few more minor display bugs here and there
- added an option to set a default toolbar icon size
- removed all support for OpenGL versions older than 3.3; this had become a necessity to reduce the maintenance workload and to simplify the code
Other
- fixed the bug which caused the export of a boat as a project to generate a corrupted file

flow5 v7.23, June 4, 2022

General
- fixed a crash bug occurring when exporting data from an analysis of an STL plane
- fixed a crash bug occurring when importing pre-v6.49 .xfl files
Modelling/Meshing
Analysis
Post-processing
UI
Other

flow5 v7.22, January 27, 2022

General
- the format of the .fl5 project file has been modified; NEWLY SAVED FILES WILL NOT BE READABLE BY VERSIONS OLDER THAN v7.21
Modelling/Meshing
- fixed an occasional crash bug when connecting triangular panels
Analysis
- fixed an error in the construction of wake panels in the case of models imported from STL meshes; this impacts the estimation of the induced drag.
Post-processing
UI
- added an experimental option to visualize flows;
- fixed a bunch of minor issues in the 3d displays
Other

flow5 v7.21, December 19, 2021

General
- the format of the .fl5 project file has been modified; NEWLY SAVED FILES WILL NOT BE READABLE BY VERSIONS OLDER THAN v7.21
Modelling/Meshing
- fixed an incompatibility between the re-use of existing RHS solutions and ground effects
Analysis
Post-processing
UI
Other
- fixed a data corruption bug when duplicating external polars

flow5 v7.20, December 11, 2021

General
Modelling/Meshing
- fixed a crash bug occuring when modifying wings with small spanwise surfaces
- fixed a crash bug occuring when connecting panels in the case of a thin surface analysis
- added an option to check element edge lengths
- added an option to export/import airfoil .dat files together with the wing's xml file; the option is set in the preferences Save/Export options"
Analysis
- Added a verification of compatibility of vortex core size and element edge length at the start of the analysis; the core size should be smaller than 1/50 the length of the smallest triangle edge, otherwise the analysis will not run.
Post-processing
UI
Other
- fixed some compatibility issues with xflr5
- fixed a few more minor bugs

flow5 v7.19, October 18, 2021

General
Modelling/Meshing
Analysis
- corrected an error in the construction of the VPW in the case of an analysis with side slip; the beta angle was applied twice; second order impact on results
Post-processing
UI
- fixed the incorrect display of the vortons in the case of a T6 analysis with side slip
Other
- fixed a few more minor bugs

flow5 v7.18, September 15, 2021

General
Modelling/Meshing
Analysis
- homogenized the signs of roll and pitch moment coefficients resulting from T5, T6 and T8 analyses; T5 analyses may need to be re-generated.
Post-processing
- fixed issues related to the export of operating point data to the clipboard and to text files
UI
- fixed minor display issues in the rendering of triangular panels
- made minor improvements to the dynamic scaling of graphs
Other
- fixed an occasional crash bug occuring after the LLT analysis of a plane with a fuselage

flow5 v7.17, August 22, 2021

General
Modelling/Meshing
- added an alternative method to connect the fuselage and wing meshes
- fixed crash bugs occurring during mesh connections in the plane editor
Analysis
- enabled the batch mode for LLT analyses
- removed the existing restriction to 4 threads of the optimization loop
- fixed the crash bug when running a scripted LLT analysis on a wing with flaps
- added panel data to the export of operating points to text files; cf. field "export_oppoint_Cp" in the template script
Post-processing
UI
Other
- fixed the bug which prevented to load .plr files generated in xflr5v6.49 format

flow5 v7.16, August 1, 2021

General
- changed the packaging method of the linux package to support the oldest LTS distribution of Ubuntu (i.e. 18.04)
- updated the import of .xfl files to be compatible with xflr5 v6.49 - flow5 v7.16 REQUIRES THE INSTALLATION OF XFLR5 v6.49
Modelling/Meshing
- added options to control the precision of wing exports to STEP files
Analysis
- added the freestream velocity field to the xml format of T5 polars
- added the the stability derivatives to the export files of T8 operating points
- added an option to set the auto-inertia flag in wing and fuselage xml files
Post-processing
UI
- corrected a bunch of minor bugs
Other

flow5 v7.15, June 28, 2021

General
Modelling/Meshing
Analysis
- activated the scripting feature for T5 and T8 analyses; cf. the updated script file;
  updated xml templates for both analysis types can be generated by exporting an existing polar to xml in flow5.
- fixed a bug which created a conflict in the plane optimization module between wing section data and wing scaling data
Post-processing
UI
Other

flow5 v7.14, June 15, 2021

General
- the format of the .fl5 project file has been modified; NEWLY SAVED FILES WILL NOT BE READABLE BY VERSIONS OLDER THAN v7.14
Modelling/Meshing
Analysis
- corrected an error in the calculation of flap moments in the case of the tri-uniform method.
- added wing section data to the variables of the optimization module
- added an option to enter a user defined friction coefficient for the fuselage drag
Post-processing
UI
- more optimization of OpenGL methods for improved rendering speed
- more tweaks to improve the rendering of icons on high dpi screens
Other

flow5 v7.13, May 23, 2021

General
- the format of the .fl5 project file has been modified; NEWLY SAVED FILES WILL NOT BE READABLE BY VERSIONS OLDER THAN v7.13
- fixed a bunch of broken links in the online documentation
Modelling/Meshing
- corrected minor mapping errors of the geometry and mass parameters when exporting to AVL files
- changed the definition of the product of inertia Ixz to be the positive instead of the negative sum as explained here. The sign error in the assembly of the inertia tensor has been corrected, with minor impact on the lateral modes

Analysis

the solution method to the panel analyses has been modified to take better advantage of the problem's linearity
corrected a sign error in the calculation of the derivative CXq in the case of triangle analyses; went unnoticed because this derivative is unused
disabled the option to set parametric surface angles in the stability analyses: not forward compatible with the simplification of panel analyses
fixed a crash bug which occured in the case of stability analyses with the tri-linear method

Post-processing

made some tweaks to improve the rendering on high dpi 4K monitors
fixed the issues with the roll/pitch/yaw sliders and the auto z-rotation in the fine 3d controls
added an option to set a custom size for the symbol on curves; the size is set in the Preferences/Graph/Other

Other

flow5 v7.12, May 10, 2021

General
- fixed a crash bug which prevented the loading of large project files in Windows
Modelling/Meshing
Analysis
Post-processing
UI
- enabled the copying of multiple analyses from one plane to another in a single operation
- fixed minor bugs related to the use of locale settings for number formatting
Other

flow5 v7.11, May 2, 2021

General
- fixed a bug which prevented the loading of files generated with versions older than beta 18
Modelling/Meshing
Analysis
- fixed the crash bug in plane batch 2 analyses
Post-processing
- fixed a bug which prevented the dynamic update of operating point data in the 3d view and in the polar graphs
UI
- more optimization of OpenGL methods for improved rendering speed
Other

flow5 v7.10, April 26, 2021

General
Modelling/Meshing
- fixed the bugs linked to foil leading edge flaps
Analysis
Post-processing
UI
- restored the dynamic selection of objects in the plane tree view when using the keyboard arrows
- fixed display issues on macOS for OpenGL context > 3.1
- deprecated the support for OpenGL contexts < 3.3 since all graphic cards less than 10 years old support OpenGL 3.3; support for OpenGL 2.1 will be removed in a future version.
- optimized the OpenGL methods for improved display speed
- other minor bug fixes and improvements
Other

flow5 v7.09, April 18, 2021

General
Modelling/Meshing
Analysis
- added an experimental module for 3d inverse design
- added a documentation page on the matter of Cp Coefficients
- made various bug corrections and improvements to the plane optimization module
- corrected an error in the calculation of stability derivatives in the case of trilinear analyses
- optimized the construction of RHS vectors for reduced build times
- fixed the bug which caused the single-precision calculations to fail
Post-processing
UI
- improved the shader used to display panel forces
- fixed some minor issues with the import of external curves in graphs
- made minor improvements to the SVG export functions
Other

flow5 v7.08, March 31, 2021

General
- finished a first set of comparisons of sail measured performance to flow5 predictions; since these preliminary results tend to show that panel methods for flows around sails are limited to narrow upwind conditions, the sail module will not be developed any further on the short term with the effort focusing instead on the plane/hydrofoil module.
Modelling/Meshing
- corrected a bug in the construction of free meshes in the case of spline type sails
- fixed trailing edge issues in the case of imported STL sails whenever the sail is modified through transformations
- changed the orientation of spline sail panels in the case of ruled meshed for consistency with free meshes
- fixed minor issues in the import process of sails from STEP files
Analysis
- added an option to switch planes from within the optimization module
- restored the missing extra drag in a boat's analysis results
Post-processing
- fixed the inverted display of Cp and Gamma in the case of tri-linear analyses of sailboats
- fixed a crash bug when exporting a boat's operating point data to a file
UI
- made minor improvements to the interface of the plane optimization module
Other

flow5 v7.07, March 20, 2021

General
Modelling/Meshing
Analysis
Post-processing
UI
- fixed minor display issues in macOS
Other
- fixed minor memory leaks
- code cleaning

flow5 v7.06, February 20, 2021

General
- the format of the .fl5 project file has been modified; NEWLY SAVED FILES WILL NOT BE READABLE BY VERSIONS OLDER THAN v7.06
Modelling/Meshing
- minor tweaks, improvements and bug corrections to the thin sail free mesh module
- activated the export of spline type sails to STEP files
Analysis
- fixed a crash bug in the LLT analysis occurring when no operating point is generated
- fixed the inoperative angle variables in T6 control polars
- added a field to the plane script to export all plane operating points to text files; see the updated template.
Post-processing
UI
- minor tweaks to the menus and shortcuts
Other

flow5 v7.05.1, February 8, 2021

UI
- fixed the bug specific to mac OS which caused menu buttons to be non interactive; fixed by reverting to Qt 5.12 instead of Qt 5.15; the dmg package has been updated with the same download link

flow5 v7.05, February 7 2021

General
- the format of the .fl5 project file has been modified; NEWLY SAVED FILES WILL NOT BE READABLE BY VERSIONS OLDER THAN v7.05
Modelling/Meshing
- activated the inclusion of the hull in sailboat analyses;valid only for fully emerged hulls such as in the case of the AC75
Analysis
- corrected a bug in the case of triangle analyses with ground/water effect which caused the contribution of the mirror wake to be ignored; slight effect on results
- corrected an error in the calculation of velocity vectors in the wake in the case of triangle methods; impacts mainly the shape of the streamlines and of the VPW; minor effect on results in the case of the VPW
- replaced the input of AWS an AWA by TWS and TWA for sailboat analyses
- fixed a crash bug when trying to run a plane analysis without a main wing
Post-processing
- added the TW properties to the variables of sailboat polar graphs
UI
- added more number localization
Other

flow5 v7.04 January 25, 2021

General
- added on option to use locale settings for number formatting; the option is set in the Preferences/Application interface --- WORK IN PROGRESS ---
Modelling/Meshing
- corrected bugs in the construction of ruled meshes of spline type sails; MESHES BUILT IN PAST VERSIONS MAY NEED TO BE RECONSTRUCTED IN v7.04
- corrected an occasional crash bug when duplicating a spline type sail
Analysis
- fixed the incorrect velocity range in the case of T6/1 control polars
- fixed the non-varying mass parameter in T6 polars
- fixed issues with the linear system solver in the case of the 2d IBL method
Post-processing
UI
- fixed a number of minor issues with the 2d IBL solver
Other

flow5 v7.03 January 16th, 2021

General
- the format of the .fl5 project file has been modified; NEWLY SAVED FILES WILL NOT BE READABLE BY VERSIONS OLDER THAN v7.03
- replaced all calls to LAPACKE routines by calls to LAPACK to enable the use of the native framework vecLib instead of MKL on macOS; the binary version of v7.03 for macOS is now linked to vecLib; the performance is comparable to that of the MKL version.
Modelling/Meshing
- added options to export wing surfaces as NURBS or swept splines to a CAD file
- fixed length unit issues when exporting shapes to a STEP file
- improved the ruled and free meshers for Spline and NURBS sails
- corrected the inverted value of the taper ratio
- made minor improvements to the design interface of solid thick sails: Windsurf.html
Analysis
Post-processing
- fixed minor things in the stability time graphs
UI
- modified the filter in the object view to filter separately objects and polars
- improved the dark mode override settings
- fixed various minor display bugs
Other
- fixed a crash bug when importing legacy .xfl project files containing operating points

flow5 v7.02 December 6, 2020

General
Modelling/Meshing
- added the sail reference dimensions to the xml files
Analysis
- added an option to duplicate an existing analysis from another plane or boat (Ctrl+Shift+D)
- fixed length unit issues in the VPW definition of sailboat analyses
- fixed various issues with scripting of boat analyses
- added the spline type wind gradient to the boat analysis xml export/import
- added the rotation around Y to the variables of a sail analysis - intended for windsurfs
Post-processing
UI
- added a dark mode override for the application's style for Windows OS
- added a customizable filter on object and polar names in the object tree views
- added an option to customize the view scale factor when using the mouse wheel
- simplified the interface to insert an existing project file
- cleaned a few minor bugs
Other
- fixed a crash bug when importing legacy .xfl project files containing operating points

flow5 v7.01_beta_19 November 23, 2020

General
- the format of the .fl5 project file has been modified; NEWLY SAVED FILES WILL NOT BE READABLE BY VERSIONS OLDER THAN BETA_19
Modelling/Meshing
- added options to build free meshes as an alternative to ruled meshes for internal NURBS-type and Spline-type sails
- added a parameter to control mesh growth from the edges inwards
- fixed a crash bug when trying to display the panels of the hull in the boat editor
- fixed a crash bug when trying to move mesh nodes in the plane editor
- fixed a crash bug when trying to animate the mesh construction
Analysis
- modified the specification method of the wind gradient in the case of sail analyses so that it is defined with a spline and not as a parabola
- modified the calculation of the discard distance of vortons which is now measured from the origin of the body axes
Post-processing
- fixed a crash bug when trying to display streamlines in the sailboat view
- corrected the export of foil polars to include all the polar data
UI
- corrected a bunch of minor bugs in the sail module views
- restored the disabled foil menu when no foil is loaded
- improved the interface to load background images in the 2d and 3d views
- fixed minor UI bugs here and there
Other

flow5 v7.01_beta_18 November 15, 2020

General
- the format of the .fl5 project file has been modified; NEWLY SAVED FILES WILL NOT BE READABLE BY VERSIONS OLDER THAN BETA_18
Modelling/Meshing
- improved the options to import sails from external STEP or STL files: External_Sails.html
- corrected some mesh construction issues in the case of sailboats
Analysis
- optimized the calculation of the VPW to take better advantage of multi-threading
- modified the stability analyses to include AVL-type controls; see the detailed explanations here
- deprecated the inertia parameters in the stability analyses
- modified the xml analysis files to include the AVL-type controls and to remove the deprecated inertia parameters
- modified the algorithm to better evaluate the Cp coefficients on panels connected to only 2 neighbours
- deprecated and removed the advanced editor for plane analysis objects
Post-processing
- corrected the missing update of streamlines in the plane's 3d view when changing the operating point
- corrected the 3d display of forces on panels with normals aligned with the negative z-axis
- added lift and drag coefficients in wind axes to the list of variables in the sail polar graphs
UI
- Added an option to load a background image in the 3d views
Other

flow5 v7.01_beta_17 October 25, 2020

General
- added online documentation for the STL type sails
- the format of the .fl5 project file has been modified; NEWLY SAVED FILES WILL NOT BE READABLE BY VERSIONS OLDER THAN BETA_17
Modelling/Meshing
- added an option to define thin sails from STL meshes
- added an option to multi-thread the fuselage cut operation; can be disabled in case the OCC algorithm turns out to be unstable
- restored the saving of panel distribution types for wing-type sails
Analysis
- restored a simplified and more robust version of the VPW live update
- restored the missing wind gradient factor in the sail analysis
Post-processing
- corrected a bug which prevented the AVL type drag to be deleted from an existing polar
- corrected a crash bug when trying to edit a sail analysis without AVL-type drag
UI
- corrected a crash bug when exiting the plane editor in the case of a plane without a fuselage
- corrected minor bugs in the spline to foil editor
- corrected a bunch of bugs in the sail analysis module
- more tweaks
Other
- fixed a few more occasional crash bugs
- code cleaning

flow5 v7.01_beta_16 October 10, 2020

General
Modelling/Meshing
- corrected a bug which caused the inertia of STL-type planes not to be computed when loading the project
- added an option to scale xfl-type planes; also scales the position of the lumped masses
- moved the fuse mesh operations to a separate thread to enable cancelling when multithreading
- made more tweaks to the mesher to improve its robustness and the quality of the resulting mesh
- corrected a crash bug when trying to export a wing with an open TE to a STEP file
- corrected a bunch of minor bugs in the xfl-type fuselage editor
Analysis
- changed the input method of the vorton core size which is now entered as a fraction of the reference chord
- removed the option to set the VPW streamwise progression factor which is now hard-coded to the value 1
- changed the evaluation method of influence coefficients in the case of tri-uniform analyses, to eliminaite numerical errors in case of perpendicular triangles
Post-processing
- added an option to modify the extra drag and AVL-type parabolic drag without deleting the rest of the polar data
UI
- improved the responsiveness of the GUI when selecting planes, polars, and operating points
- corrected an incorrect scaling of the vorton display size when changing units in the preferences
- fixed a bunch of bugs in the sail analysis module
- removed some obsolete or useless features
Other
- fixed a few more crash bugs and other minor issues
- code cleaning

flow5 v7.01_beta_15 September 23rd, 2020

General
Modelling/Meshing
- improved the surface mesher for speed of execution and mesh quality
- corrected various modelling bugs in the case of wing type sails
- improved the shape healing features of the CAD fuse editor
- added an option to scale the background image in the xfl type fuselage editor
Analysis
- moved the vorton core size, the VPW length and the VPW iterations from the global settings to the analysis definition
- optimized the VPW calculations for faster execution
- disabled the option for live updating of the VPW during the analysis: creates too much code complexity and too many potential instabilities */
- simplified the batch mode for plane analyses - uses now the pre-loaded analyses instead of xml files
- corrected some bad crash bugs and other minor things in the plane batch analysis module
- added optional AVL type parabolic profile drag to the polar; this is intended for STL-defined planes to compensate for the missing airfoil viscous drag
Post-processing
- Fixed the empty display of the fuse drag variables in the polar graphs
GUI
- corrected minor display bugs in the 3d sail views
Other
- corrected crash bug issues when loading projects including sailboats
- added a specific user-defined directory for STL files
- removed updates of user-defined directories on load/save operations
- code cleaning

flow5 v7.01_beta_14 September 3rd 2020

General
- the format of the .fl5 project file has been modified; NEWLY SAVED FILES WILL NOT BE READABLE BY VERSIONS OLDER THAN BETA_14
Modelling/Meshing
- made various optimizations and bug corrections to the operations on STEP/IGES type fuselages
- improved the robustness of the surface mesher
- corrected an error and a crash bug in the import process of STL files
- improved the STL plane reader
- corrected the unit factor when exporting meshes to STL; meshes will be written using the active length unit
- added an option to import a plane's inertia from another plane
Analysis
- activated the analysis of planes defined by STL meshes; see the detailed explanations and step-by-step tutorial. EXPERIMENTAL.
- fixed an occasional crash bug due to thread conflicts when constructing RHS vectors; as an indirect consequence RHS constructions are slightly slower than in beta 13
- corrected triangle connection errors in case of very thin trailing edges
- corrected an error in the evaluation of the moment induced by the pressure forces acting on the fuselage
Post-processing
- restored the animation of stability modes and corrected the display of the roll mode
- corrected a bunch of minor bugs affecting the 3d view and the graphs
GUI
- improved the display of formulas for OS dark mode settings
Other
- corrected a bug when exporting a plane with no foils as a project
- code cleaning

flow5 v7.01_beta_13 August 9th 2020

General
- the format of the .fl5 project file has been modified; NEWLY SAVED FILES WILL NOT BE READABLE BY VERSIONS OLDER THAN BETA_13
- modified the management of the max. thread count which is now made at application level instead of task level
- fixed project loading issues with boat polars
- removed a minor memory leak ocurring when discarding a wing edition
Meshing
- Reduced the minimum acceptable size of triangular panels
Analysis
- modified the analysis method for T6 polars: the analyses are now performed in stability axes instead of body axes; this is to simplify calculations with sideslip or ground effect; no impact on results which are converted back to body axes. Due to a modification of the 3d display rendering method, the operating points with vorton wakes will need to be re-created.
- activated the sideslip for T6 analyses: Jibe2_lateral
- activated the ground effect for the T6-VPW: Ground effect
- added various minor optimizations to reduce the computation times of T6-VPW analyses
Post-processing
- cleaned-up the main 3d view to better represent wake panels and vortons
- added lift and drag forces in wind axes to the list of variables of polar graphs
- corrected a missing velocity scale factor in the display of strip forces
- removed the option to display surface velocities - not useful and induces too much code complexity; replaced by the option to display the perturbation velocities in a crossflow plane.
GUI
- modified the surface colour picker to use Google's material design colours

flow5 v7.01_beta_12 July 20th 2020

This version introduces the Vortex Particle Wake. A description, a tutorial and a comparison to wind tunnel test results can be found in these documents:
Building_blocks.html
VPW.html
Jibe2.html

You can also choose to watch the live explanations and the demo on Youtube:
flow5 - Introduction to the Vortex Particle Wake
flow5 - The Vortex Particle Wake
flow5 - The Jibe2 experiment
flow5 - VPW roll-ups (no commentary)

General
- the format of the .fl5 project file has been modified; NEWLY SAVED FILES WILL NOT BE READABLE BY VERSIONS OLDER THAN BETA_12
Modeling
Meshing
- modified the position of the control point on degenerate quad panels at the side's LE and TE to be at the triangle's COG; very minor impact on results
Analysis
- first activation of the Vortex Particle Wake - EXPERIMENTAL
- corrected an error in the analyses of quad polars with ground effect; the induced drag was incorrectly evaluated - significant impact on results
- corrected the construction of the RHS vector in the case of control polars applied to planes with a fuselage; the RHS components were set to 0 on the fuselage; minor impact on results
- corrected an error which caused the last triangle of the wake columns to be skipped in triangle analyses; very minor impact on results
- disabled the Neumann BC for thick bodies - the method is inherently unstable
- disabled the LE and wing shape parameters in control polars - not of great use for prohibitive added complexity
- disabled the evaluation of lift and drag by summation of panel forces - imprecise results
- enabled viscous interpolation from Cl for T6 analyses; these analyses are incompatible with the viscous loop
- improved the convergence of T2 LLT analyses
GUI
- grouped all the 3d scale controls into one tabbed widget
- set the same scale for surface velocity and downwash velocity
- minor improvements and corrections in the 3d views
- restored the missing curve style page in Windows in the fast graph settings

flow5 v7.01_beta_11 June 29th 2020

General
- the format of the .fl5 project file has been modified; NEWLY SAVED FILES WILL NOT BE READABLE BY VERSIONS OLDER THAN BETA_11
Modeling
- added an option to design a NURBS fuse to fit a set of control points; see here for detailed explanations

Meshing

made more tweaks to the advancing front mesher to improve its robustness
modified the triangle connections at the thick wing tips to improve symmetricity in the case of fins
modified the triangle connections at the central section to improve Cp calculations for triangular analyses; requires regeneration of the operating points
corrected the connections of quad panels at surface tips to improve Cp evaluation in the case of 3d quad panel analysis
added more check options and display helpers for quad meshes

Analysis

modified the calculation of the pitching moment in the case of tri-linear analyses to use Cp values at nodes instead of an averaged Cp over the panel's area; see here for detailed explanations
optimized for speed the construction of the RHS vectors using linear combinations; reduction of analysis times for t7 polars by 50%
fixed non convergence issues of T6 polars using the tri-linear method
hard-coded the position of the vortex and control point positions on the quad panels at 25% and 75% respectively to avoid unintentional mods when saving/loading settings

GUI

modified the display of pressure forces in the case of trilinear polars to display the arrows at the nodes instead of at the panels' center
corrected the horizontal flip view so that it is performed around the z-axis instead of the y-axis
added an option to export 2d views to SVG files
made the length of panel forces independent of the selected pressure unit
added a context menu to the analysis range tables
added an option to offset the origin of the background image in 2d views
restored the Ctrl+C and Ctrl+V shortcuts in the tables
added a check for point mass duplicates when exiting the plane inertia dialog

Other

corrected mapping errors when importing plane analyses from legacy .xfl project files
removed a crash bug when trying to change the active polar while running an analysis
removed some occasional and minor memory leaks

flow5 v7.01_beta_10 June 21st 2020

Analysis
- corrected an error in the calculation of the stability derivative Xq - minor impact on longitudinal modes
- reduced the default value of the vortex core radius from 0.5mm to 0.05mm; the former value could create issues with small mesh elements; the value can be modified in the 3d analysis settings
GUI
- fixed issues with the 3d display of spanwise lift, drag and downwash

flow5 v7.01.beta_09 June 14th 2020

General
- added full compiler optimizations to improve execution speeds
Design
- added an option to set the number of panels at the wing tips; recommendation is n>1; use n=1 to maintain compatibility with earlier versions
Analysis
- improved the calculation of the induced drag which is now evaluated at half the wake's length; this prevents wake end effects which could cause apparent negative drag on the elevator; see here for detailed explanations
- improved the calculation algorithm for Cp coefficients in the case of the tri-linear method;
  errors vs. theoretical results are now 0.25% for the sphere and 0.9% for the cylinder for a 5000 size mesh; project files and details: Validation.html
added an option to run analyses using multiple aoa or ctrl ranges
added a batch analysis mode using the xml analysis files
added automatic update of inertia ranges when running a T6 or T7 analysis if auto-inertia is activated
fixed the bug which caused the neutral point position not to be added to the polar variable in stability analyses
corrected a minor error in the geometric construction of node normals on thin surfaces; very minor impact on results in the case of tri-linear analyses

Scripts

added handling of multiple ranges for the aoa and the control parameter; see the updated template.
corrected a bug which caused the script to use CUSTOM reference dimensions even if PROJECTED or PLANFORM were specified in the polar xml file
added missing fields Include_Other_Wing_Area, Adjusted_Velocity, Delta_n in the Xml analysis files; export analyses to get updated templates for each type.
corrected a write error when exporting operating ranges of control polars to xml

Sail analysis module

corrected the moment variable in Boat polar plots which had a 2x factor in excess
corrected various minor issues with the 3d display

Post-processing

restored the display of LLT operating points in wing graphs
corrected minor GUI issues related to T3 speed polars
corrected the display of the arrow representing the global force for negative lifts
corrected the display of the location of the thick arrow representing the global force

Other

added an option to plot a fast graph with custom data in a floating window (Ctrl+G) - EXPERIMENTAL
added multithreading to some lengthy geometry construction tasks
fixed occasional crash bugs linked to async repaint of the main 3d view
added an option to read custom line colours from the colorlist.txt file located in the application's directory; this file must hold 72 colours
improved again the dark mode settings

flow5 v7.01.beta_08 May 17th 2020

General

the format of the .fl5 project file has been modified; NEWLY SAVED FILES WILL NOT BE READABLE BY VERSIONS OLDER THAN BETA_08
the binary package for Windows has been compiled with msvc2019 instead of msvc2017; as a consequence, it may be necessary to run once the vc_redist.x64.exe executable if Microsoft's redistributable Visual C++ libraries are not installed on the system; this package can also be downloaded from Microsoft.
the binary packages of this version makes use of a new licensing system

Design

added alternatives to SINE and COSINE distributions for less violent panel bunching - experimental
corrected some minor issues when designing a foil from 1 or 2 splines

Meshing
- improved the advancing front mesher to avoid divergences in special cases of coincident vertices
- added automatic removal of null triangles which could hinder the analysis
Analysis

corrected an error in VLM2 analysis which caused asymmetric results. Only apparent in the case of low spanwise panel densities and in presence of sweep; impacts the results.
corrected the construction of wake panels in the case of control polars; were aligned with the aoa direction, whereas they should be aligned with the x-axis since the geometry is rotated; impacts the results.
activated the ground effect option for Dirichlet BC, i.e. cases of thick surfaces and fuselage
parallelized the computation of velocity vectors to reduce analysis times
corrected a crash bug when running control polars

Scripts

restored the option to load foil .dat files
made the search for .dat and .plr files recursive starting from the specified directories
added an option to load XFoil-generated polar files in text format when running a script
corrected a crash bug when requesting the export of all plane polars using either the GUI command or when running a script
corrected a bug which caused xml plane files not to be found when running a script
removed the obsolete legacy option Ignore_Body_Panels in the analysis .xml files and replaced it with Include_Fuse_Moments. Export an analysis to xml to get an updated template.

3d views

added sliders to fine-tune the 3d viewpoint
added an option to display the ground surface in the 3d view if the ground effect is active
added an option to use 2-colours based gradients for 3d colour maps
added an option to display contour lines on top of the colour map for tri-linear operating points
fixed the updates of the aoa and other values in the 3d view animation
restored the highlighting of the selected frame in the fuse edition view
added an option for model autorotation around the z axis
fixed various issues with light settings

Pre-processing

modified the sorting of plane polars using the plane as first index and the polar name as second index; this displays the polars names in alphabetical order in the in-graph legend

Post-processing

fixed the slow computation times of streamlines along y-lines and z-lines
corrected minor errors in the streamline algorithm
added an option to display forces on parts in the 3d view; represented as arrows with origin at the 1/4 chord point
corrected the output of forces on parts in the Operating Point properties box
added the local strip forces to the operating point graphs
corrected the plot of the Fx_FF variable to the polar graphs, so that it includes the viscous drag and to give it in wind axes rather than body axes
corrected the plot of circulations in Operating Point graphs for VLM analyses

implemented automatic copy of export file paths to the clipboard for quick insertion in external applications
added an option to antialiase graph plots - active by default
added an option to antialiase all 2d views - active by default
added an option to export graphs to SVG images
implemented curve deselection when clicking elsewhere than on a graph curve
added new options for curve symbols - messes up existing cross symbols in legacy project files
added a checkbox to toggle visibility of all curves
multithreaded more tasks for increased UI responsiveness
improved dark mode settings

Sail design and analysis

corrected minor interface issues in the 2d and 3d views

OpenGL

improved the options to test OpenGL contexts
fixed the inoperative save of OpenGL settings
improved antialiasing by multisampling for contexts >= 3.3
removed unnecessary tasks when closing the app to speed up the exit process

removed a few more minor bugs

flow5 v7.01.beta_07 March 25th 2020

modified the format of the .fl5 project file; NEWLY SAVED FILES WILL NOT BE READABLE BY VERSIONS OLDER THAN BETA_07
corrected minor bugs in the algorithm used to approximate a foil with a cubic spline
modified the calculation method of angular derivatives for triangle methods - slight impact on results
corrected an error in the calculation of the lateral stability derivatives Xq, Yr, Lr, Nr
modified the calculation method of control derivatives: the angular position of the control surface is now set independently of the gain.
corrected an error in the calculation of control derivatives due to a confusion between degrees and radians
corrected the calculation of the vertical tail volume in the case of double fins - info only, no influence on results
removed a few more minor bugs

flow5 v7.01.beta_06 February 19th 2020

modified the format of the .fl5 project file; NEWLY SAVED FILES WILL NOT BE READABLE BY VERSIONS OLDER THAN BETA_06
modified the input/output of the script files:
- all output files are created directly in the specified output directory instead of a subdirectory; it is up to the user to specify or not the sub-dir in the output path
- plane polars output files take the name of the polar and are exported into a subdirectory with the plane's name
- the log file takes the name of the project file with the .log extension
- scripting in Windows now accepts the backslash in directory paths
improved the algorithm to build the intersection of wings and fuselage
removed the SECONDWING option; all second wings are replaced with OTHERWING
added an option to include the area of OTHERWINGs in the polar's reference area
added an option to plot streamlines in a vertical plane
modified the streamline generation algorithm for improved smoothness and for compatibility with future vortex particle wake
fixed the error which corrupted the export of planes as project files
restored the option to check for application updates
modified the SVG export format for increased versatility
added the vertical tail volume T_v=(S_fin x l_fin)/(S_wing x span_wing) to the output of the plane's properties
removed a few more minor bugs

flow5 v7.01.beta_05 January 14th 2020

removed the hard-coded limit on the max. number of operating points/run; added an option tto set this limit in the 3d analysis settings.
corrected a bug in glide polars which caused the calculated balanced speed to depend on aoa increment
corrected the stability analysis of planes with fuselages to take into account the option to exclude the contribution of fuselage panel forces to moments
corrected the length of the first streamline segment when applying an offset in the streamwise direction
restored the option available in xflr5 to store operating points even if the viscous interpolation is unsuccessful
restored the bending moment variable in the operating point graphs
improved the construction of the geometry of wings with a center gap
added an experimental option to export foil geometries to SVG files; export options can be set in the preferences
added a menu entry to load a legacy xflr5 project file
fixed occasional crash bugs when loading legacy xflr5 project files
fixed the crash bug when trying to display surface velocities in the 3d view
fixed more issues with macOS dark mode
removed a few more minor bugs

flow5 v7.01.beta_04 January 4th 2020

modified the calculation of induced drag in the case of triangle analyses by averaging the downwash over the trailing panel's width instead of using the value at mid-panel; this improves the accuracy of the predictions in case of high velocity and pressure gradients, for instance where the wings connect to the fuselage
corrected the error in the calculation of the fuselage form factor
corrected the variables Fuselage Drag and Fuselage Drag Coefficient in the polar graphs
added an option in the T1 & T2 analyses to interpolate viscous properties from Cl rather than Alpha, i.e. using the xflr5 method
added the effective angle of attack defined in the Ting & Chaparro report to the list of operating point graph variables
added the strip circulation to the list of operating point graph variables
corrected a bug which prevented the saving of modifications of the fuselage geometry after edition
corrected the algorithm to set a TE gap in the case of non-unit foil lengths
more tweaks added to make the triangle mesher more robust
fixed buffer overflow issues in the 3d display of streamlines
added an option to paint streamlines using the wing's colour
fixed some colour issues for macOS dark mode
removed a few more minor bugs

flow5 v7.01.beta_03 December 20th 2019

fixed the bug which caused the triangulation to disappear after a rotation action in the STL fuselage view
fixed a bug which caused the triangular mesh not to be generated after the import of an STL file
fixed a crash bug when importing a STEP file with undefined local surface normals
added foil name display as tooltip when hovered over in the foil design view
improved the robustness of the algorithm to modify a foil's TE gap
updated the mac package with the missing MKL libraries for mac pro configurations
added OpenGL shader logging to trace file
forced the use of deprecated functions and v120 style shaders if the requested version of the OpenGL context is
fixed some colour issues for macOS dark mode
removed a few more minor bugs

flow5 v7.01.beta_02 December 1st 2019 - First public release

implemented the fix for xflr5 bug report #147
restored some missing shortcuts in the foil view
corrected the display of plane streamlines with ground effect included
improved the management of overlaid curves in graphs
removed a few more bugs

flow5 v7.01.beta_01 November 24th 2019

added an option to import and overlay external curves in graphs
added an option to import plane polars and their data from an external source
removed a few bugs

flow5 v7.01.alpha_03 November 13th 2019

activated the advancing front mesher and deprecated the p-space mesher
optimized for speed the lengthiest tasks of the display and of the analysis
added an option to display the free edges of the triangle mesh
added thickness representation to the geometry shader for OpenGL 3.3+
corrected minor errors in the calculation of stability and control derivatives
converted sail forces from wind axes to geometric axes, which makes more sense for boats
added automatic unit scaling to meters when importing a STEP file
added an option to import and overlay external curves in graphs
added an option to import plane polars and their data from an external source
removed a few bugs

flow5 v7.01.alpha_02 October 15th 2019

implemented glide polars for xflr5 request 141
added wing design parameters to control polars
set a temporary back-end project file instead of the sync project
removed a few bugs

flow5 v7.01.alpha_01 September 28th 2019

enabled multithreading of the MKL routines on Windows and macOS
restored the signal connections between docked and floating graphs
restored the activation of plane polars when clicking curves in the polar graphs
added an option to import .plr files from the menu
added a menu link to the release notes
activated the link to update checks
removed a few crash bugs

flow5 v7.01.alpha_00 September 16th 2019 - Changes vs. xflr5 v6.47

Analysis
- implementation of 3d Galerkin triangular panel method using uniform doublet densities
- addition of a linear panel methods for increased accuracy
- generalization of multithreading for relevant tasks
- addition of a viscous loop for control polars
- addition of control polars
- addition of scripting capability
- addition of the INTEL MKL fast matrix solvers
- addition of a fuselage drag model
- use of OCCT to export bodies to STEP or IGES format
- use of OCCT to export wings to STEP or IGES format
- use of OCCT for inertia properties
- removal of the hardcoded limit on the number of wings
- addition of the capability for standalone body analyses
- addition of the capability for multi body analyses
- addition of forces and moments acting on each of the plane's parts to the polar graphs

GUI
- customizable default line width for all curves
- pickable Cp values in the 3d views
- addition of copy/paste capability in tableviews
- import/export of inertia data from/to clipboard
- export of object data to the clipboard
- export of graph data to the clipboard in spreadsheet format
- new simplified and more intuitive fuse and plane edition forms
- improved plane, wing and fuse design interfaces, with 3d views
- addition of 3d views in the design dlg boxes
- capability to open the 3d view in a separate window
- capability to open graphs in separate windows
- interpolated cubic spline and extrapolated BSpline for foil design and retro-engineering
- customizable automatic format for polar names
- selective x-y zoom in graphs
- selectable and highlightable curves in graphs and legends
- addition of a secondary vertical axis in graphs
- storage of log files for each analysis in a user defined directory

Sail7 merge
- Addition of wing sails
- Removal of SailCut type sails
- Removal of hulls from the analysis

Code
- removed all hard-coded limits in the 3d analysis module
- huge code overhaul for improved stability and portability

Features removed
1. Tilt. Geometry: was an experimental feature which generated more problems than it fixed
2. textures - fun feature, but too much overhead work to maintain in flow5

xflr5 v6.62, , 2025

updated the export to .plr files for compatibility with Qt6
added an option to discard spurious XFoil operating points
fixed an OpenGL compatibility issue with Wayland
bunch of minor fixes to the UI

xflr5 v6.61, November 13, 2023

xflr5 v6.60, November 1, 2023

xflr5 v6.59 April 23, 2023

fix for bug reported in ticket 205
fixed the inoperative manual name feature in the foil analysis definition form
fixed an occasional crash bug in inverse design when closing a project
fixed minor issues in inverse design
added an option to display the curve of maximum Cl in the plane operating point graphs
first release of binaries with the Qt6 libs
code cleaning

xflr5 v6.58 December 2, 2022

xflr5 v6.57 May 7, 2022

xflr5 v6.56 April 10, 2022

xflr5 v6.55 February 23, 2022

xflr5 v6.54 December 29 2021

fixed a bug which limited to 2 the number of threads used in foil batch analyses.
fix for bug report 179
fixed some compatibility issues with Qt6 and VS2019

xflr5 v6.53 November 28 2021

xflr5 v6.52 November 24 2021

restored the polar type selection and the storage of operating points in foil batch analyses
fixed some minor mouse focus issues in the 3d views
fixed some minor compatibility issues with flow5

xflr5 v6.51 October 24 2021

fix for bugs reported in tickets 167, 168, 169, 170 and 171
fixed the loading of xml analysis files in foil scripts

xflr5 v6.50 September 8 2021

fixed the crash bug ocurring when running foil T4 analyses
fixed the crash bug which prevented to load project files containing foil operating points
fix for bug report 166 - the changes to the Re/Ma/NCrit parameters in a batch analysis are now recorded
simplified the UI for foil batch analyses
code cleaning and refactoring

xflr5 v6.49 August 1 2021

the format of the .xfl project file has been modified; NEWLY SAVED FILES WILL NOT BE READABLE BY VERSIONS OLDER THAN v6.49
deprecated the support for OpenGL 2.1; the default and recommended configuration is 3.3; all the display options may no longer be available for OpenGL 2.1
removed the support for textures - feature of limited interest which induced far too much code complexity
deprecated and disabled the legacy batch mode for foil analyses; superseded and replaced by the threaded batch analysis
fixed the missing degree to radians conversion in the input of q(°/s) in forced time response graphs
fix for bug report #165
fixed a first batch of issues related to bug report 163
fix for bug report #162
made improvements to the foil script module
updated a bunch of methods deprecated by Qt
fixed an occasional crash bug ocurring in the case of large number of wing sections closely spaced in the spanwise direction
merged the xflr5-engine library into the main project
code cleaning and refactoring

xflr5 v6.48 November 23 2020

added the tranlsation to Catalan language by David Canovàs
fixed the bug which caused results of tilted geometry analyses to depend on the aoa sequence; cf. bug report 156
fixed an occasional crash bug when importing a body from xml files
added a scripting capability for foil analyses to complement the flow5 plane scripts
added an option to select the OpenGL format from the in-app test window
added an option to select the OpenGL format and the trace flag when launching the app from the command line
fix for request #144
fix for request #147
corrected the bug which caused unconverged XFoil operating points to be stored
removed the addition of .dat and .plr type files to the recent file menu list
added an option to set style flow-down from the LinePicker dialog
fixed a crash bug when deleting the last entry of the point mass tables in the inertia dialog
replaced the deprecated sprintf() with QString::asprintf() for forward compatibility
added translation to Catalan

xflr5 v6.47 July 7th 2019

Fixed the problem of initial conditions when running an LLT analysis
Modified the color display of Cp coefficients in the 3d view, to render more accurately the uniformity of singularities on panels
Added an option to align the children objects style with their parent's style
Fixed a couple of crash bugs when editing a part of a plane with an active polar
Fixed potential crash bugs when editing plane parts during 3d animation
Fixed potential crash bugs when deleting planes or foils from the Manage options
Fixed a crash bug when running a 3d panel analysis from and old project files due to no wake defined
Corrected a minor output error in LLT analysis
Fixed potential memory leaks when loading corrupted project files
Tentative fix for bug #140
File name cleaning
code cleaning

xflr5 v6.46 May 4th 2019

fix for bug #134 - LLT now restored in v6.46
fix for bug #139 - corrected the crash bug when switching from plane design to another app with streamlines displayed
fixed some other minor issues
code cleaning

xflr5 v6.45 April 10th 2019

updated the German and French translations
added VAO support for the OpenGL 3.2+ core profile
fixed a crash bug when trying to plot BL graphs without an active operating point
corrected the names of some variables in boundary layer plots
corrected imperial unit conversions in the foil polar definition
changed the unix directory for shared files to /usr/local/share instead of /usr/share
increased the sampling of the foil's mid camber line from 100 to 1000 points; this improves the precision of the calculated camber and thickness value and position
disabled the auto-check for update feature due to crash bugs on some systems
added error management to the check for update process
cleaned up all .pro files
code cleaning

xflr5 v6.44 January 7th 2019

tentative fix for an occasional crash bug when displaying streamlines or surface velocities
fix for bug #128 relative to the display of the wings and body in the advanced plane editor
fix for bug #126 relative to the highlighting of frames in the advanced fuse editor
feature request #127: shortcut added for the menu entries "show only associated polars"
fix for bug report #121 - synchronized the background image position with the object views
mod for request #124 - added an option in the spline parameters to force closed LE and TE.
prevented the multiple repaint of surface velocities in the 3d view
corrected minor errors in the derotate operation of airfoils
corrected translations errors from fortran to C in the XFoil flap setting routine - thanks to Nicolas C.
added an optional automatic check for updates at startup
completed the archiving of the default plane polar with all of its data. Incremented the format of the project file to 200002.
corrected a crash bug when trying to overwrite a saved foil operating point
code cleaning

xflr5 v6.43 August 27th 2018

corrected the wrong sign of viscous pitching and yawing moments - slight impact on results
fixes for request #117 relative to the construction of double fins for a plane with a body
corrected the calculation of the tail volume for wings with an offset leading edge
set the "ignore body panels" to true by default in the definition of the 3d analysis
corrected a bug in the display of inertia values for a wing or body - no impact on results
forced thin surface analysis whenever more than one wing is defined
improved the VLM mesh of flapped surfaces with hinge points located at different %chord
corrected the asymetric position of double fins
corrected a potential crash bug when trying to display panels for a plane with a body and an LLT type polar

xflr5 v6.42 May 19th 2018

restored the option in Windows and linux to launch the app by opening a project.xfl, polar.plr, or foil.dat file
corrected a bug which prevented the reference dimensions of an analysis to be updated when the geometry is modified by the user
moved the XFoil and plane analysis modules in separate shared libraries for future re-use
fix for bug report #114; as a fallback also added in the 3d display settings an option to enable/disable the clip plane
fixed a bad crash bug when typing a number 6+ to request the display of an inexistent graph
fixed the display of shortcuts in the MacOS menus

xflr5 v6.41 April 22nd 2018

corrected a numerical bug inthe calculation of twist for pure vertical surfaces i.e. dihedral=90°; would formerly cause a division by zero and lead to inconsistent results
corrected a precision issue in the estimation of wing inertia which could lead to underestimation of the total volume
corrected the color scale of panel forces in the 3d view; was proportional to q.S.Cp instead of q.Cp
added an option to import/export wings to xml format
corrected the export of flat panel bodies to STL to avoid null triangles
raised the max cumulated number of span stations from 250 to 1000 for a plane
code cleaning

xflr5 v6.40 January 7th, 2018

fixed a bug which caused the stability analysis to calculate the operating point with the aoa of the previous calculation
corrected a potential crash bug when trying to display 3D results of an LLT calculation
removed the default suffix "-proj_area" from the name of plane polars
restored the output of non-dimensional control derivatives in the operating point properties
restored the option to export BL data to text files
restored the option to enable or disable autosave which was always turned on
included the missing NURBS degrees in the serialization of the body objects
added a protection to the max degree of NURBS vs. point count
code cleaning

xflr5 v6.39 September 14th, 2017

improved the GUI for the plot of BL results in the XFoil Direct Analysis module; corrected a few bugs at the same time
modified the calculation of the lift coefficient at each span station in VLM and Panel Analysis; is now F.dot(SurfaceNormal)/q.S instead of F.dot(WindNormal)/q.S formerly; increases slightly the viscous drag and the viscous moments as a side effect
implemented a more robust process to save the project files
disabled the Neumann boundary condition for the 3d panel method
removed the extra 180/PI factor in the calculation of stability time response to initial conditions
corrected a bug in type 1 polars with positive sideslip, which caused to ignore the aoa when computing the viscous quantities
minor correction to the calculation of type 5 polars
other minor corrections and improvements

xflr5 v6.38 June 5th, 2017

fixed the random behaviour bug in the OpenGL view

xflr5 v6.37 May 28th, 2017

added a verification of the OpenGL version at startup
fixed two bad crash bugs when derotating a foil and when defining a flap

xflr5 v6.36 May 22nd, 2017 - limited release only

xflr5 v6.35 May 15th, 2017

Added an option to adjust the number of worker threads in a foil multithreaded analysis
Fixed some memory leak & overflow issues in foil analysis; improves the stability of the analysis
Other minor improvements

xflr5 v6.34 April 15th, 2017 - limited release only

Forced the default renderer to be OpenGL and not Angle on Windows desktops
Added an option to export time graphs to text files

xflr5 v6.33 March 26th, 2017

corrected the calculation of the downwash and induced angle for the VLM method. Was twice what it should be. No impact on other results.
corrected the calculation of the damping ratio; was formerly lambda.real()/omega_damped instead of lambda.real()/omega_natural
changed the calculation method of Stability derivatives from forward differences to centered differences. The only noticable difference is for Xw which changes significantly. However this derivative seems to have low influence on the eigenvalues, and the flight modes should be almost unchanged.
modified the construction of wings with dihedral and tilt - minor effect on results
improved the wing sweep scaling
reorganized the library structure; the XFoil library is now limited to the XFoil class
bug corrections and minor enhancements

xflr5 v6.32 January 8th, 2017

bug corrections and improvements to the xfoil direct analysis module

xflr5 v6.31 January 6th, 2017 - Not released

added a "light theme" option
allowed multiple import and export of Planes and Analysis objects from text and xml files
moved the execution of LLT and Panel Analysis to separate threads
set the default reference area for plane analysis to the projected area on the x-y plane
corrected the calculation of the tail volume when the main wing is not located at the origin; note that the tail volume value is not used in the calculation, it is only provided for information.
bug corrections and minor enhancements

xflr5 v6.30 November 6th, 2016

updated the license agreement from GPL v2 to v3
separated the GUI from the analysis engines
added an option to hide flap moments in the operating view
added a style property for foil points
corrected and improved the calculation and display of analysis with sideslip; impact on results
code cleaning
bug corrections and minor enhancements

xflr5 v6.14 May 29th, 2016

modified the calculation of stability derivatives to take into account viscous drag and extra drag
added mass and CoG position to the list of variables for stability polar graphs
corrected issues in the construction of wings with inverse dihedral
corrected an error in the calculation of a mode's damped natural frequency
made some adjustments to batch analysis of foils to speed up execution
added some animations to the 3d view transitions
removed the limitations inconsistent with the GPL in the credits window
fixed a few minor bugs

xflr5 v6.13 April 16th, 2016

upgraded to OpenGL 3.0+ from the deprecated OpenGL 1.0
improved the lighting options in 3D view
improved text rendering on high-DPI (Retina) displays
added an option to paint textures on the plane's surfaces
added an option to export 3D object geometries to binary stl format
added an option to autosave the project at regular time intervals
added XCp.Cl as a variable to the plane's polar graphs, and d(XCp.cl)/dCl = XNP to the plane's legend
changed the panel force display to q.Cp instead of q.S.panel_area; this is more significant since the arrow lengths are now mesh independent.
added the extra drag in the calculation of the plane's total drag coefficient
fixed the crash bug when running a multithreaded batch foil analysis
fixed the issue of slow display in XInverse design
fixed some stability issues in XInverse design
interface improvements in XInverse design
added a selection option for inertia units
changed the display in the foil OpPoint view so that the foil can be overlayed on the graph
code cleaning

xflr5 v6.12 January 9th, 2016

modified in depth the constuction of the wing geometry, to better account for flap with large deflections; has an impact on results;
restored the plot and export options of the boundary layer graphs after a converged xfoil analysis
introduced an option to add extra drag to polar objects, to account for surfaces not included in the plane object
corrected bugs in the import/export operation of body objects to xml files
enabled the LE points of the spline foil to be dragged in Direct Design
corrected a minor error in the construction of the foil's mid camber line; potential small impact on VLM results
corrected other minor things

xflr5 v6.11, August 9th, 2015

added an option to customize the target lift distribution curve in the wing's operating point view
added inertia data as parameters in stability analysis
added more display options for curve points
replaced the deprecated QGLWidget by the new QOpenGLWidget recommended in Qt5.4
added a new editor for the plane object
added a new editor for the body object
reviewed in depth the 2D rendering system to separate viewing operations from the analysis part
replaced the rendertext methods in OpenGL by custom implementations to improve the rendering quality
improved the issue of the plane-fin intersection when the body is translated
enabled launching xflr5 from a project file, and opening the model
added an import/export option of a plane definition to an xml file
added an import/export option for body objects to an xml file
deep code cleaning
other minor corrections and improvements

xflr5 v6.10.04, April 12th, 2015

Corrected a potential crash bug when deleting a plane with polars
Added a standard ISA model for the calculation of air properties
Corrected the issues with the reference lengths after wing scaling
Fixed the bugs related to the import operation of a body definition from a text file
Fix for retina displays on OS X
Corrected the export of plane polars to text files to include the sideslip variable
Other minor corrections and improvements

xflr5 v6.10.03, April 13th, 2014

Corrected the incorrect calculation of the mid camber line of foil with flaps
Corrected the crash bug when calculating a wing with flaps using the LLT method
Corrected the crash bug when deleting foils from the manage dialog box

xflr5 v6.10.02, March 21st, 2014

Added an option to scale the wing's area and aspect ratio
Fixed a potential crash bug in Graph scales drawing when no project is loaded
Improved the support for OpenGL on Windows platforms
Changed the calculation of satbility derivatives to be always invsicid - no noticeable impact on results
Modified the calculation of the foil mid line and wing mid surface - reduces issues with foils with coarse panelling at leading edge
Added and option to display panel normals and vortices - meant to help check if foil panelling is fine enough
Added an option to set manually the reference dimensions for the calculation of aerodynamic coefficients of planes
Fixed the issue with the storage of modified foils in inverse design
Fixed the issue of ineffective a.o.a. increment in Batch Foil Analysis
Fixed the bug which caused the flap moment not to be reset at each plane calculation
Other minor cosmetic changes

xflr5 v6.10.01, February 1st, 2014

Created a new binary .xfl projet file format. Replaces once and for all the awful .wpa format
Removed the option for independent wing analysis
Introducing type 5 polars for the analysis of variable sideslip
Disabled the horseshoe vortex method for stability polars, for beta-polars, and whenever sidelip is defined.
Aligned the viscous drag vector with freestream velocity rather than with x-axis - slight impact on viscous results
Enabled LLT analysis for all Plane objects
Removed the option for symmetry in 3d analysis
Corrected the bug in type 4 plane analysis- elevator and fin coefficients were incorrectly calculated
Removed the default sizing for panel and matrix arrays. The arrays are now allocated for the size of the largest model loaded in the session
Corrected some memory leaks
Corrected memory allocation/release mismatches
MASSIVE code cleaning
Created GUI-independant classes for 3D-panel analysis and LLT analysis
Minor corrections and enhancements

xflr5 v6.09.06, December 7th, 2013

introduced number input/ouput using system locale settings
mesh resizing is now enabled without any limit other than the one set by the compiler and the system
corrected the automatic polar name of foils in multithreaded analysis
removed the access to the array of body objects; each body is now attached to a single plane
fixed the translation issues
improved the default stylesheet
solved most (all?) of the issues with OpenGL text rendering
fixed the bug which caused the pitching moment to be zero
added an option for import/export of the wing geometry via plain-text files
removed the option to save as a file for xflr5 v5 or v4 - no point and source of bugs
fixed the issues with the animation of foil operating points
made the code compatible with msvc nmake
deep code cleaning
other minor corrections and enhancements

xflr5 v6.09.05 Beta, March 20th, 2013

Modified the project load method to keep the data even for corrupted files

xflr5 v6.09.04 Beta, March 2nd, 2013

Added optional stylesheets for application toolbars
Fixed a few bugs
Made some other minor enhancements

xflr5 v6.09.03 Beta, January 5th, 2013

Added an option in the polar definition dialog to ignore the body in the plane analysis
Corrected the bug which created straight streamlines after a failed analysis
Corrected a crash bug in plane inertia definition
Corrected the automatic polar name for foils
Corrected the bugs in body edition
Corrected loading issues of old files
Restored the max number of points in a plane calculation to 100, with correspondig increase in memory usage>
Deep code cleaning

xflr5 v6.09.02 Beta

xflr5 v6.09.01 Beta, November 18th, 2012

Modified the wing twist definition which is now applied around the panel's quarter chord rather than around the y-axis. Impact on results.
corrected the bugs in body edition
fixed a few crash bugs
code cleaning

xflr5 v6.08, October 20th, 2012

corrected the scaling of foil thickness and camber
corrected the incorrect foil automatic polar name
corrected the issue with zero-length wing sections
corrected the occasional crash bug in plane definition with elevators
minor bug corrections and enhancements

xflr5 v6.07, June 25th, 2012

fixed type 2 batch polar analysis
fixed the issue with incorrect 3D-panel calculations
corrected the incorrect aileron control derivatives
corrected the bug in wing analysis with ground effect
corrected the bug in type 4 analysis for wings and planes
corrected the bug which modified the chord length as twist increases: impact results for wings with high dihedral
cleaned, corrected, and improved the code for B-Splines
removed the option for Min/Max type controls in Stabillity Polars
added an option to edit Wing Polar paramaters
fixed the crash bug when defining wings with more than 16 span sections
corrected a bug leading to incorrect results in stability derivatives with active controls (CPanel::RotateBC())
removed the Splined Points Foil option
other minor corrections and enhancements
code cleaning

xflr5 v6.06 January 28th, 2012

changed and hopefully improved the algorithm which intersects wing surfaces and body
reduced the maximum size of sections, masses, and chorwise panels on a wing to reduce global memory usage
minor bug corrections and enhancements
code cleaning

xflr5 v6.05 beta, July 24th, 2011

For Type 7 polars, listed the control value instead of the aoa in the top drop down box
Added a calculation form to determine Re.sqrt(Cl) for foil Type 2 polars
Added the Japanese translation to the repository - thanks to Koichi
Minor corrections and improvements

xflr5 v6.04 beta, May 14th, 2011

added a settings save at each project save
added and option to view forces on panels as coloured arrows
fixed the incorrect setting of AVL-type controls for flaps in T7 analysis
added the missing write operation in the project file of the control variable for wing operating points
modified the setting of boundary conditions in T7 analysis with activated controls - impact on balanced aoa
modified the wing construction process to allow for a gap in the middle of the wing
corrected the bug which caused the disapperance of the left stability toolbar when switching to 3D view
corrected the bug which prevented from changing the default number of panels in naca foil generation
continued the code cleaning process

xflr5 v6.03 February 13th, 2011

modified the geometry connection between panels with dihedral and twist - may slightly impact the results
corrected the calculations with sideslip
added multi-threading capability for foil batch analysis
added an option to display the position of point masses in 3d-view
in the export to AVL of point masses, corrected the missing addition of wing x & z position
modified the export format to AVL of with wing flaps
added an option to highlight the currently selected operating point, or the mode in root locs view
changed the interface for stability analysis
added a properties dialog box option for operating points
corrected various minor bugs
made several minor enhancements

xflr5 v6.02 Beta December 19th, 2010x

added an option to load a background image in the foil direct design module
corrected some errors in CoG and inertia automatic calculations, with impact on results
did some deep code cleaning
re-organized the panel analysis code to perform only one far field calculation per operating point
optimized the panel method for increased speed of execution
corrected the mesh edition for NURBS bodies
changed the export format for graphs
implemented the stability method for mixed panel/vlm method
implemented the stability method for full 3D panel method
corrected the bug which lead to incorrect results in 3D panel with Neumann B.C.
corrected the error in the jump in potential at the wing's trailing edage in full 3d panel method
set the estimation of inertia properties at the time of polar definition instead of evaluating at the time of analysis
fixed the bug which could cause a crash when dragging a point in splines design
corrected the asymetric transition location for symetric wings
corrected the source strength influence of thick panels on thin surfaces, with impact on results for planes with body
corrected the Cp 3D color display for VLM2 analysis
added the influence of pressure forces acting on the body to induced pitching moment coefficient
added calculation of neutral point position based on Cma/Cza ratio
corrected various minor bugs
made several minor enhancements

xflr5 v6.01 Beta October 14th, 2010

Corrected the incorrect balance speed in 3D type 2 polars for planes
Corrected the final moment calculation in stability analysis
Corrected the incorrect lift calculation in stability analysis

xflr5 v6.00 Beta September 19th, 2010

added Stability and control analysis
changed the 3D-panel method for planes from full 3D to mixed thin/thick surfaces
doubled the maximum acceptable size for mesh definitions, i.e;. new value is 5000 panels max.
refined the inertia evaluation for wings by considering mass distribution in the spanwise direction
added an option to run polar batch calculations on a list of airfoils
changed the foil list table in XDirect
corrected the display bug for stippled lines in 3D view
added an option to reverse the zoom direction with the mouse wheel
made some code cleaning in VLM and 3D-Panel analysis

XFLR5 v5.00 April 11th 2010

changed the executable target name from QFLR5 to xflr5
changed and reorganized drastically the source code file system
changed the unix directory for translated files to /usr/share/translations
added the spec file for the creation of rpm packages
corrected the bugs linked to undo/redo of spline modifications in direct design
corrected a bug linked to a potential incorrect type in WPolar Dlg
correctd the option to save in v4.00 format
made some code optimization for increased speed
made other minor improvements and corrections

QFLR5 v0.04 Beta December 27th 2009

Replaced the confusing term XCmRef by CoG; added z-position for CoG
Added some signal connections for wing control polars
Declared a bunch of local variables as static to speed things up by preventing repetitive memory allocations
Corrected the bug associated with tilted geometry calculations
Corrected an error in the calculation of downwash for secondary wings and fins - main wing was OK
Improved the 3D view of lift and drag for results with sideslip
Fixed the issues with animation in Miarex
Fixed the issue with 3d Cp scale settings
Corrected a bug in the estimation of the CoG for wings
Corrected incorrect summation of a plane's inertia components
Forced the use of QPaintEngine::OpenGL, which seems to fix the font display issue
Corrected a crash bug when selecting splines in Direct Design
Corrected a crash bug when capturing the OpenGl view to an image file
Adapted the code for Qt4.6.
Made a few corrections and enhancements

QFLR5 v0.03 Beta October 25th 2009

Added a form to evaluate the CoG and inertia of wings and bodies
Redefined the pitching moment and yawing moments for clarity - details in the guidelines paragraph 5.16
Added an option to store oppoints in foil batch analysis
Marked more sentences for translation
Corrected a crash bug which occurred when trying to run a biplane analysis without an elevator
Corrected Tail volume calculation - was missing a PI/180 coefficient ; no impact on results
Corrected lift calculation in Type 2 polars. The lift was calculated by two different methods in separate parts of the code leading to incorrect results
Corrects bugs related to projected areas for aero coeff calculations
Corrected incorrect units in reference length for AVL export

QFLR5 v0.02 Beta September 1st 2009

Corrected many bugs
Made a few minor enhancements
Provided a template for translations

QFLR5 v0.01 Beta July 4th 2009

QFLR5 is a re-write of XFLR5 using the Qt4 libraries.
The goal is to make the code cross-platform and available for Linux and Mac OS.
The current beta version offers 95% of functionnalities available in XFLR5, and does not provide any additional feature except for a different look and feel interface.
In the future, only this cross platform version will be supported.
Once it has reached a stable state, it will be released as XFLR5 v5.00

v4.17 June 1st 2009

Corrected the bug which prevented the definition of a control polar
Corrected the bug which prevented to run a foil Type 1 analysis after having run a type 4 analysis

v4.16 April 13th 2009

Added an option to use the area and span projected on the xy plane for aerodynamic coefficients, instead of the developed planform span and area values
In 3D wing analysis, corrected the pitching moment calculation to include the viscous pitching moment generated by the viscous drag when the wing has a z-offset
Corrected the bug by which the main wing's position wasn't taken into account in the calculation of a plane's tail volume
Also in the tail volume calculation, corrected the confusion between deg and rads which gave false values if the elevator was not in the xy plane
Corrected the bug which prevented convergence of foil inviscid analysis the first time
Improved the export option for Plane/wing operating points, to enable post-processing of Cp values in a spreadsheet
Corrected the bug linked to airfoil duplication which could cause the code to crash
made other minor corrections

v4.15 January 24th 2009

Corrected the bug which prevented to run 3D analysis with step less than alpha =0.1 or Cl = 0.1
Corrected a bug in foil Polar for the power factor Cl3/Cd2
Corrected a bug which could cause the program to crash in the case of a wing defined with flapped foils, if the foils were deleted
Corrected a bug in foil Type 4 polars which could lead to display an incorrect alpha value in the OpPoint view
Corrected a minor bug relative to inoperant graph translation in some cases

v4.14 December 30th, 2008 (limited release only)

v4.13 beta December 06th, 2008

Improved the export interface to AVL for planes and wings, including control surfaces
Improved the interface for 3D cross section Cp display
Added an option to export any graph's curves to a .txt or .csv file
Switched to Trefftz plane integration for lift force in 3D Panel method --> impact on results
Set default coresize = 1�m minimum both in VLM and Panel methods
Corrected a minor bug in the display of bodies imported from text files
Corrected a minor bug in Inverse design which prevented a second consecutive application of the spline
Made a few cosmetic improvements

v4.12 beta November 16th, 2008

Added options to export/read body definitions to/from simple text files; The file format may be obtained by exporting any body
Added an option to export the client area to an image file
Fixed issues with file paths while saving
Fixed the bug which prevented XFLR5 to launch after a selection of the thumbnail window
Set the default parameter for 3D panel wake length to 100 x MAC instead of 1 x MAC
Added the x-coordinate to export of current XFoil results
Added option for .csv format option for all txt file exports
Fixed a rare crash bug when using foil polars with zero content
Corrected the bug which prevented to insert a projet in the one currently opened
Improved the MMI of the panel list in the wing design dialog

v4.11 beta November 2nd, 2008

Changed the twist/washout application method ; used to be set around y-axis irrespective of dihedral; is now set around the panel's quarter chord, once the panel has been rotated by the dihedral angle
Improved the foil flap setting algorithm, which generated incorrect geometries in some special cases
Corrected a 1/2 missing factor in the output of non converged LLT oppoints - no effect on results
3D panel with tilted geometry: corrected wake tilting
Improved streamline display to reduce singularity effects, essentially by enforcing Kutta's condition
Changed the algorithm for induced drag calculation in 3D panel analysis - slight difference in results from v4.10
Solved the multiple storing issue of identical Opps
Corrected a bug which could occasionnaly prevent from reading the saved settings
Cleaned up the code
Compiled with MSVC 2008 instead of .net

v4.10 beta September 13th, 2008

Corrected a minor bug in Control Polars - no influence on results

v4.09 beta September 3rd, 2008 (limited release only)

Corrected factor 2.0 in excess in induced angle in VLM analysis
Corrected mix up in plane controls when performing a control analysis with multiple flaps
Added extra decimals in AVL geometry export
Corrected downwash display for planes
Corrected factor 2.0 missing in MAC span position
Corrected bug when running a single point calculation for 3D panel method - error on results for symetric calculations
Refined the Lift calculation in Type 2 Polars; was missing a cos(a.o.a)
Made a few cosmetic improvements

v4.08 beta July 20th, 2008

Corrected the bug which caused to ignore weight and speed parameters in control polars
Forced Dirichlet Boudary Conditions for 3D analysis
Corrected a crash bug when loading some project files
Added an option to change axis color & style in 3D view

v4.07 beta July 11th, 2008

First release of Type 5 and Type 6 Control Polars for planes
Corrected spline foil bug

v4.06 beta June 25th, 2008

Corrected display of OpPoint results in animated 3D view

v4.05 beta June 23rd, 2008 (limited release only)

Improved the Type 5 Control Analysis Polar
Corrected incorrect orientation of local panel vector in 3D analysis - sensitive only for very high thickness airfoils

v4.04 beta June 9th, 2008 (limited release only)

Corrected the inoperative animation in 3D view

v4.03 beta June 5th, 2008 (limited release only)

Corrected the crash bug for a number of cumulated span stations greater than 100
Corrected the geometrical bug when setting a flap on a foil
Changed the De-rotation for the airfoil, to take into account the flap

v4.02 beta April 6th, 2008

Corrected a 1/1.1225 factor missing in XCP calculation in VLM analysis
Added check to make sure there are at least three chorwise and three span-wise panels - necessary for 3D Panel analysis
Made a few cosmetic changes to body view

v4.01 beta March 24th, 2008

Corrected the omission of the airfoil's contribution to the pitching moment in VLM and 3D-Panel
Corrected wing surface normal calculation in case of a zero-length panel
Changed the scaling center in 3D view

v4.00 beta March 16th, 2008

Introduced 3D-Panel Method
Redefined the moment coefficients - see the guidelines for details
Corrected a sign error on geometric yawing moment in VLM analysis
Changed the fin definition: all planes with fins will need to be redefined...
Changed 3D view rotation with arcball
Corrected an error in Ground effect in VLM
Added Reflected curve display in XInverse
Added Slope tangency constraint on spline in XInverse
Inverted Cp signs in VLM 3D Delta_Cp display
Added option to offset the main wing in a plane design
Corrected the area of double fins or symetrical fins: factor 2 had been ommitted
Corrected occasional crash bug when deleting all Opps associated to a Wing or Plane Polar
Corrected chord calculations when there is a gap in the middle of the wing
Corrected a potential crash bug when loading a project file which includes a plane object
Added a save check before loading a file from the recent file menu
Modified the panel Normal definition as a necessary step for 3d panel methods. VLM results are slightly modified for twisted surfaces.
Changed X-View in 3D display to view the plane from the rear
Corrected MAC span position calculation
Corrected mid line inversion bug in Splined Points App
Corrected "Reset Default" values in LLT/VLM advanced setttings, to set default vortex core size at 0.1mm
Corrected potential file write error at the end of Foil, LLT, or VLM analysis
Corrected minor bug in the panel VLM creation routine which could define a non-trailing panel as trailing ; no impact on results
Corrected other minor cosmetic bugs

v3.21 June 17th, 2007

Trouble with internal messaging issues: Deleted all V/W_ENDTHREAD messages, replaced them with idle loop checking for end of analysis
Added tentative volume calculations to plane and wing definitions
Introduced a Biplane option in wing analysis
Corrected the tail volume calculation for V-Tails
Introduced an option to edit spline ctrl points coordinates
Released the constraint on spline leading and trailing points to allow their translation
Added Recent File management
Removed the foil's automatic length normalization: operation will need to be performed manually
Corrected the initialization of the Inverse Design to take into account the latest foil loaded in XFoil
Introduced Moment display in the Wing 3D view
Corrected a few more cosmetic bugs

v3.19 March 31st, 2007- First release at SourceForge.net

Add an option to export panel geometry and Cp values to a text file
Changed the bending moment calculation for negative values
Added an option to hide the text output in XFoil BatchDialog
Added an option for ground effect in VLM Analysis
Added an option to hide the Cp graph in XFoil analysis
Changed internal units to I.S.
Modified the light & shading settings in 3D wing display
Corrected the bug which limited the number of foil points to 271
Added an option to read foil files with no foil names, or with points in reverse order
Corrected the foil normalization process
Added an option to export current xfoil results to file
Added HMom calculation in XFoil
Modified the meshing process for wing panel with flaps, to accomodate the break at hinge location
Added reference curve display in Inverse Design to enable foil comparisons
Corrected a few more cosmetic bugs

v3.15 January 21st, 2007

Corrected the bending moment calculation - was calculated in absolute value along span (impact on results)
Changed the title of the incorrectly named "static margin" for wing polars
Corrected the pitching and yawing moment calculation for planes with elevators and fins (impact on results)
Reduced the max number of wing panels to 30 instead of 100 to reduce loading times and memory usage
Added XCp export for foil polars
In LLT, changed the calculation of XCp to interpolation of XFoil polars (impact on results)
Corrected the bug which created a double operating point for foils at alpha=0
Modified the streamlines drawing process for supposedly smoother streamlines
Changed the position of the wake vortex in VLM2 - very minor impact on results
Corrected crash bug when importing XFoil or Javafoil polars
In Batch Analysis, increased the text limit in the output window
Added option to perform inviscid VLM Analysis
Made a few enhancements and cosmetic improvements
Corrected a few minor bugs

v3.08 November 19th,2006

Modified foil management interface in Direct Design
Deleted Auto VLM mesh interface
Corrected Drag scale 3D-display for panels with high dihedral
Changed Cp 3D-display option to show the lift's component which is normal to the panel rather than the lift's vertical component
Corrected visual display of the fin's lift (was using fin area as ref area instead of using wing area); Good observation Marc !!
Added XCp in XFoil polar graph variables
Added L.E. Flap option
Corrected panel interferences in flap option
In wing local lift and local drag calculation, changed the erroneous c.cl/mean geom. chord to c.cl/m.a.c.
Change the order of twist and dihedral application in wing construction, with impact on results for wings with high dihedral such as winglets
Changed Direct Design presentation to facilitate foil comparisons
Changed wing construction panel
Added Opp Point display on the Wing Opp model
Corrected bug for plane calculations with wing panels less than critical size
Added import routine for javafoil-generated polars
Modified the automatic mesh method for wings to increase panels at wing tip
Added light options for 3D views
Modified double fin option to make fins reflected rather than identical
Added analysis parameters to .set file
Added option to set minimum wing panel legnth to be taken into account in analysis
Corrected a minor memory leak in XFoil analysis
Corrected printing bug for dashed and dotted lines
Corrected minor bugs
Made several minor cosmetic improvements

v3.01 September 24th,2006

Corrected a major bug impacting results when calculating a Plane with the VLM-Quad method ; the consequence was a double count of the elevator's lift
Added stream lines display
Added tilt angle for fins
Added length unit conversions to plane definition Dialog box
Added option to perform VLM on tilted geometry
Made minor cosmetic improvements

v3.00 September 6th,2006

Introduced VLM method based on quad rings
Re-wrote the VLM in full vectorial 3D, with impact on results essentially for wings out of the x-y plane
Introduced VLM Plane analysis
Corrected a few bugs (no impact on results)
Made minor cosmetic improvements

v2.01 November 7th,2005

Reverted to Trefftz plane analysis for induced drag calculations. Cf. Guidelines Rev. paragraph 5-4-2 for explanations.
Added option for batch calculation from Reynolds and NCrit list
Added option to start batch calculations from alpha=0 to improve convergences
Fixed the EndAnalysis bug while moving window
Corrected error in Airfoil Pitching Moment calculation in VLM analysis (OpPoint only... Value in polars is correct)
Added automatic generation of 4 & 5 digits NACA foils
Added VPlot capabilities for last XFoil Direct Analysis
Added memorizing of Alpha for each polar in Wing Analysis
Corrected spline commands in XInverse
Corrected sweep and twist scaling bug in Wing Design/Scale Wing
Solved a few more minor bugs (no impact on results)
Made a few cosmetic improvements

v2.00 September 29th,2005

v1.99v035 September 24th,2005

Cancelled loading of WOpp results in WPolars when loading a projet
Corrected interpolation process for OutPoints in VLM
Changed Rename process for polars and WPolars

v1.99v034 August 31st,2005

Virtually identical to v33

v1.99v033 August 28th,2005

Re-transferred transitions to the polar's definition !
Implemented re-initialization of LLT after unconverged iterations
In VLM, added Cm and XCp calc based on forces rather than on thin airfoil theory
Corrected VLM panel save in wpa file
Suppressed common foil constraint at wing's plane of symmetry
Corrected many more bugs

v1.99v032 July 14th,2005

Corrected minor bug in 3D view

v1.99v031 July 6th,2005

Added legend to 3D view
Added twist to 3D view
Converted all floats to doubles to accelerate computations since C works in double

v1.99v030 June 23,2005

Corrected crash bug in foil polar view

v1.99v029 June 22,2005

First test of double precision calculations
Added legend to 3D view

v1.99v028 June 8,2005

Separated flap from transition parameters

v1.99v027 June 1st,2005

Last batch of minor bugs
Fixed the extended status bar bug

v1.99v026 May 26th,2005

Introduced Y-Zoom in BSpline app
Introduced Animation in wing design
Improved print capability, including B&W option

v1.99v025 May 12th,2005

Corrected resource leaks and other bugs

v1.99v024 April 30th,2005

Last round of corrections & improvements before relase of V2.00 ?

v1.99v023 April 22nd,2005

Corrected foil flap bug on interpolated bugs

v1.99v022 April xxx,2005

v1.99v021 April 2nd,2005

v1.99v020 March 20th,2005 - releasable as v2.00

Corrected again PCd VLM calculation

v1.99v019 March 18,2005

v1.99v018 March 18,2005

Added import/export of AVL format
Added bending moment calcuation
Corrected PCd VLM calculation

v1.99v017 March 5,2005

Reset graph defaults in wing design
Added bending moment calculation

v1.99v016 February 26th,2005

Added automatic VLM mesh on insert/delete panel
Corrected a few more bugs

v1.99v015 February 20th,2005

Reverted to Induced drag calculation by surface force integration rather tha in the Trefftz plane
Corrected ClSpec bug in foil batch analyis
Made minor enhancements and modifications

v1.99v014 February 17th,2005

Beta version released for testing

v1.99v013 February 14th,2005

Introduced severals cosmetic refinements
Developped new options for VLM calculation
Changed VLM Induced Drag calculation to Treffz plane
Added optimal elliptic wing loading display

v1.99v012 January 30th,2005

Corrected duplicate wing bug

v1.99v011 January 26th,2005

Corrected induced drag calculation for VLM

v1.99v010 January 23th,2005

Introduced several mods and corrections required by users
Introduced VLM Calculation

v1.99v009 December xxxth,2004

Introduced automatic discard of unconverged WOpPoints, and re-initializationa after divergences

v1.99v008 December xxxth,2004

Corrected another batch of bugs !

v1.99v007 December 17th,2004

Corrected a first batch of bugs, including moment calculations

v1.99v006 December 10th,2004

Incorporated Miarex v006 to XFLR5
Reengineered code based on MainFrame/View architecture

v1.25 November 6th,2004

Increased general code robustness (hopefully...)
Fixed "Show Points" crash bug
Fixed "Init Boundary Layer" crash bug in Batch Dialog
Fixed "On Sequence" crash bug when no foil is loaded
Added power factor for negative Cl values: -|Cl|^(3/2)/Cd
Added 1/sqrt(Cl) to the polar graph variables,Cl>0
Added "Keep curve" option in Cp Graph
Made more minor enhancements and corrections

v1.24 September 1st,2004

Enabled Re input higher than 1 million
Added Cd x 10000 variable for Polar graphs
Added polar type filter for display
Made minor enhancements and corrections

v1.23 July 1st,2004

Introduced Type 4 polars: fixed Alpha, variable Re
Increased polar format to "4" for storage of Type 4 polars
Made minor enhancements and corrections

v1.22 June 9th,2004

Suppressed the idle loop which generated unnecessary processor utilization
Corrected export bug from Mixed inverse
Corrected bugs linked to mouse position and context menus

v1.21 May 28th,2004

Added option to set BL and pressure distribution styles
Removed Cl^3/Cd^2 from graph variables (apparently a confusion with the power factor Cl^(3/2)/Cd)
Fixed Export OpPoint bug
Redirected all file openings from the explorer to the first instance of XFLR5, if any is already running
Made minor enhancements and corrections

v1.20 May 9th,2004

Moved Foil and Polar selection to toolbar
Fixed crash in initial inviscid analysis (Thanks Windsurfer)
Fixed result display bugs in inviscid analysis
Authorized sequence analysis for decreasing Cls and Alphas
Added two polar graphs view
Added option to define variables in all graphs
Added Cl/Cd, Cl^(3/2) / Cd and Cl^3 / Cd^2 in graph variables
Added inviscid result to OpPoint, even if viscous analysis is unconverged
Added IterationBlocks and Iteration Limit to ".def" files and to settings file
Added automatic geometry normalization on load of foil
Resized wake arrays in OpPoint
Added option to skip OpPoints storage and to keep only polar data
Made minor enhancements and corrections

v1.17 April 18th,2004

Solved Graph scale bug when dragging and zooming
Solved Smooth() bug in Mixed Inverse design (Thanks Windsurfer)
Solved crash problem when visualising Polars
Solved Cancel Analysis bug in batch analysis
Added minor grid in Direct Design
Improved RenameFoil dlg box behaviour
Made minor enhancements and corrections

v1.16 March 26th,2004

Solved Bug in Animate() which mixed ?ppoints from different foils
Resized arrays in Direct Design
Corrected and improved scaling of Foils' thickness and camber
Made minor enhancements and corrections
Solved more bugs

v1.15 March 15th,2004

Added batch analysis capability
Added Direct design from splined curves
Added interpolation of foils
Added Camber and thickness scaling of foils
Added zoom capability on foil in Inverse Design
Added zoom cursor both in main dialog and in Direct and Inverse Design zoom
Added zoom from middle button down and vertical mouse movement
Modified Camber & Thickness calculations
Limited all drawings to dc's bitmap sizes
Corrected Grid bug drawing in Direct Design
Made minor enhancements and corrections

v1.14 February 27th, 2004

Suppressed CSytemsDependencies which may be the cause of conflict on some operating systems

v1.13 February 26th, 2004

Added Grid option in Direct Design
Corrected resource leak in Animate()
Added DeleteObject() in all graphics interfaces
Corrected initial degree display in Direct design
Removed double points in polar objects
Changed polar format to "3" for showpoints toggle
Made minor enhancements and corrections

v1.12 February 08, 2004

Added automatic load of buffer foils in Direct Design
Added zoom & drag capability in all graphs using mouse button & wheel
Associated ".plr" files to XFLR5
Associated ".opp" files to XFLR5
Associated ".dat" files to XFLR5
Made minor enhancements and corrections

v1.11 February 2nd, 2004

Made minor enhancements and corrections

v1.10 February 1st, 2004

Implemented Full Inverse Design routine (MDES)
Implemented Mixed Inverse Design routine (QDES)
Made minor enhancements and corrections

v1.00 February 2nd, 2004 - First release of non-beta version

Added Q Graph in analysis
Added Q serialization in OpPoints
Made minor enhancements and corrections

v0.36 January 13th, 2004

Added X axis control in CPGraphOptions
Added minor grid option for graphs
Added half-point lines options
Made minor enhancements to design module

v0.35 January 10th, 2004

Resized controls to fit 800x600 screens
Defined macro parameters for XFoil arrays
Resized snew[4*IBX], isys[IVX][ISX], qinvu[IZX][3], in xfoil.h
Resized usav[IVX+1][ISX] in XFoil::setbl()
Added Grid option for graphs
Added single polar graph option
Corrected print bug in design module
Added "Undo" option in design module

v0.34 December 26th, 2003

Corrected ipan/va/vb/vz/vm/vdel array sizing bug in xfoil.h
Corrected qnew and q_ac array sizing bug in Xfoil::update()
Forced 'Apply' request when exiting PANE menu
Added recognition of '#' comment character in Foil files
Added View Log File Menu
Added 'Foil Menu' with option to rename/delete foils
Corrected more minor bugs / made minor enhancements

v0.33 December 23rd, 2003

Redirected XFoil message report to "XFLR5.log" file rather than to CRichEditCtrl because of potential incompatibility with Windows 2000 and older windows systems.
Added Automatic polar name option
Modified the design interface in depth
Added color/width/style save for "plr" files - changed format to "2"
Solved bug related to change of output points number in deisgn module

v0.32 December 20th, 2003

Added Xfoil Advanced settings control
Added XFoil message report
Solved RDEF bug
Solved Boundary layer print bug
Solved Legend print bug on Cp graph
Solved PANE and CADD bugs and changed appearance
Solved Design failure bug after 2 loads
Solved Double-click bug in Design Module
Changed "Set Analysis" behaviour so that parameters are kept from one setting to another
Grouped all polar commands in a single dialog box
Added automatic load of settings at start-up and save on exit
Solved yet more bugs !

v0.31 December 14, 2003

Solved bug linked to PANEL command
Solved bug linked to Clspec/Alphaspec toggle
Solved various bugs

v0.30 December 10, 2003

Added option to work simultaneously on different foils and superimpose their Polars
Added Type 2 & Type 3 analysis
Added Cl Specification capability
Added "Cdp" storage in Polars - no compatibility with former format (author apologizes)
Modified "Export Polars" to use same format as XFoil
Added "Import Polar" feature to read XFoil-generated polars
Added dialog box for free/forced Transition parameters
Added equivalents of XFoil's WDEF and RDEF
Added flap control
Added Graph background color control
Changed iteration track variables to "rms" and "max" instead of "rms", "cdf" and cdp"
Increased space for foil animation drawing
Solved "Cancel analysis" bug in Viscous Iterations which caused Xflr5 to run in a loop
Solved various bugs