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aerodynamic airplane angle of attack approximately aspect ratio body of revolution boundary layer calculated chord chordwise COMMITTEE FOR AERONAUTICS compressible flow computed CONFIDENTIAL critical Mach critical speed determined displacement thickness distance downwash effect electromagnetic-analogy model estimated exit flaps factor fillet formula forward underslung duct fuselage Helmholtz coil horizontal tail incompressible increased increment induced velocity inlet inlet-velocity ratio integral interference velocities internal drag Langley Field Langley Memorial Aeronautical large duct lift coefficient lifting-surface theory magnetic-field strength measured Memorial Aeronautical Laboratory momentum equation NACA nacelle NATIONAL ADVISORY COMMITTEE oblate spheroid obtained orifice plate outlet pressure coefficients pressure distributions pressure recovery propeller operating propeller removed radiator round channel search coil shown in figure skin-friction slope small duct small forward underslung spanwise static pressure stick-fixed neutral point tests thrust turret two-dimensional upper turret values velocity distribution velocity ratio voltage vortex sheet vortices wake WARTIME REPORT wing surface