![]() The main competing theory of the time was 'conformal theory'. Thick airfoil theories would come later - many of which would only be practical with digital computers. It was the first theory that could do a good job modeling arbitrary airfoils (not just very special cases). Thin airfoil theory was developed during a very active time of aerodynamics (1900-1930 ish). Small disturbance, small angles, and the general assumptions that go along with linearizing the governing equations. liquid, or if a gas, you are near the low Mach number limit where compressibility is not important) Incompressible flow (fluid medium is incompressible, i.e. ![]() Inviscid flow (flow without viscosity / friction) Thin airfoil theory is based on a laundry list of assumptions - I may miss some, but here are the big three.
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