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It was written at MIT by professor Mark Drela. XFOIL is an interactive program for the design and analysis of subsonic isolated single-segment airfoils. I keep a much more extensive list on my Free Aircraft Design Software site.
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This page shows a small collection of free airplane design software to solve computations for Preliminary Aircraft Design, Wing & Aircraft Aerodynamics, Aircraft Stability and Aircraft Structures. Free Aircraft Design Software for Aerodynamics, Stability and Structural Design
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