High Quality Content by WIKIPEDIA articles! XFOIL is an interactive program for the design and analysis of subsonic isolated airfoils. Given the coordinates specifying the shape of a 2D airfoil, Reynolds and mach numbers, XFOIL can calculated the pressure distribution on the airfoil and hence lift and drag characteristics. The program also allows 'inverse design' - it will vary an airfoil shape to achieve the desired parameters. XFOIL was first developed by Mark Drela at MIT as a design tool for the MIT Daedalus project in the 1980s. It was further developed in collaboration with Harold Youngren. The current version is 6.9. It has not been actively maintained since 2001. Despite it's vintage, it and it's successor (XFLR) are still widely used. XFOIL was originally written in FORTRAN. A successor, XFLR, written in C++ and based on XFOIL is still actively maintained.

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