General description

XFLR5 is an analysis tool for airfoils, wings and planes operating at low Reynolds Numbers. It includes:

XFoil's Direct and Inverse analysis capabilities
Wing design and analysis capabilities based on the Lifiting Line Theory, on the Vortex Lattice Method, and on a 3D Panel Method

flow5 is version 7 of xflr5. It has been released to open source on January 1^st , 2026.

Documentation

Radio Controlled Soaring Digest 2008-02 : Francesco's great article to get started with XFLR5
Results_vs_Prediction.pdf: A comparison of performance measurements to XFLR5 results
XFLR5_Mode_Measurements.pdf: A comparison of stability measurements to XFLR5 results
Point_Out_Of_Flight_Envelope.pdf : The detailed explanation and fix for the error message "Point is out of the flight envelope"
XFLR5_and_Stability_analysis.pdf : My very personal view of stability analysis

Survol_Bases_Aero_et_XFLR5.pdf : Bases aérodynamiques pour l'utilisation de XFLR5
Guide théorique pour XFLR5 : Traduction française des Guidelines
Tutoriel pour effectuer ses premiers pas dans XFLR5 : 4ème version, décembre 2013
Point_Out_Of_Flight_Envelope.pdf : Explication détaillée et méthode de résolution du problème

xflr5 tutorial: My first attempt at a video tutorial. This is intended for newcomers, but may also be of help to more experienced users.

flow5: The next version of both xflr5 and sail7.
http://raphael.mit.edu/xfoil/: Original XFoil code as provided by M. Drela and H. Youngren, and of which the present application is derived.
http://perso.wanadoo.fr/scherrer/matthieu/aero/miarex.html : Calculation method for multi-airfoil wings based on XFoil or Experimental Results.
sail7: A derivative for the analysis of sails.

As with the original XFoil, the current software is released under the GNU General Public License , with all the associated rights and restrictions.
The code has been developped exclusively for the design and analysis of model aircraft. Please consider using flow5 for all other applications.
XFLR5 is released free, without any guarantee of any kind. Design of all products with the use of the code will be at the user's entire risk.
XFLR5 is by no means a professional product, and does not offer the same guarantees of robustness, reliability, precision or product support than commercial softwares.