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airfoil analysis angle of attack approximately blades body width booms brake horsepower BREWSTER F2A calculated cargo airplane cargo body center of gravity cient coeffi COMMITTEE FOR AERONAUTICS comparison compressibility effects configuration cowling-fuselage critical speed drag coefficient drag-lift ratio estimated fineness ratio fixed transition flap and fore flap deflection fore flap fuselage helicopter rotor horsepower increase indicate Langley Field Langley Memorial Aeronautical lift-drag polar lifting-body longitudinal stability Mach number maximum lift coefficient mean aerodynamic chord measured Memorial Aeronautical Laboratory modified wing NACA NATIONAL ADVISORY COMMITTEE normal nose 2-A original flap path parameters parasite drag performance pitch angle plain ailerons position power curves power-off PV-2 helicopter quarter-chord point range reference Republic XF-12 airplane Reynolds number rotor speed shown in figure skin friction slope spindle-angle setting sq ft stability and control streamline bodies tail area required thrust coefficient tip-speed ratio torque trailing edge tunnel values variation WARTIME REPORT wing area