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aerodynamic AERONAUTICS AND SPACE aileron airfoil airfoil section airplane angle of attack approximately attached flow Basic hub Body surface boundary boundary-layer center of pressure characteristics charcoal chord combustor compression corners configuration cPcr curved surfaces decrease drag coefficient effect engine experimental Figure 9 fluorine free-stream fuel fuel-air ratio full-span helicopter rotor hydrazine inches Inches of mercury incident-shock models incipient separation increase indicated injector investigation jet-augmented flap Langley Langley Field lift coefficient longitudinal Mach number range maximum lift measured NACA NACA RM NASA NASA MEMO NATIONAL AERONAUTICS nondimensional obtained oxidant parasite drag percent permeability pilot opinion pitching-moment pressure distribution pressure rise pressure-rise ratio Quadripole body radius reaction reference Reynolds number roll performance rotor separated region shell showerhead shown in figure SPACE ADMINISTRATION speed strut temperature tests thermocouples thrust tip Mach numbers trailing-edge flaps trim values variation velocity wing