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acoustic aerodynamic AERONAUTICS AND SPACE aircraft airplane analysis angle angle of attack application aspect ratio attenuation balance blade calculated cargo Center characteristics coefficient concept configuration considered constant Continued core curve determine discussed distribution drag duct effect engine estimate example exits factor Figure flow force FORMAT frequency function given impedance increase indicated injection internal jet noise length lift liner load Mach number maximum measured method NASA NATIONAL AERONAUTICS noise nozzle operating parameter payload peak percent performance position predicted present pressure procedure PUBLICATIONS radian range rectangular reduced reference Research rotor shown in figure sound specimens spectra spectrum speed steels structural TABLE TECHNICAL temperature thickness thrust tone U.S. Customary Units values vortex weight wing WRITE xe/cr