Aerodynamic principles of the direct lifting propeller (1934)
NASA Technical Reports Server (NTRS) · leaf 63
Jigs. 3,4 1T.A.C.A. Technical Memorandum !To. 7?3 figure .3.-Blade form of "ideal" autogiro. (lancet shape). The dotted lines are the plan form assumed in the analysis. The solid lines re- present a practically feasible "blade form, which in effect is little different from the other. … figure 4,-Air flow and forces at "blade element of autorotating lifting propeller.
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