Aeroacoustic wind-tunnel tests of a light twin-boom general aviation airplane with free or shrouded-pusher propellers
H. Clyde McLemore, Robert J. Pegg, United States. National Aeronautics and Space Administration. Scientific and Technical Information Office, Langley Research Center
National Aeronautics and Space Administration, Scientific and Technical Information Office, 1980 - Technology & Engineering - 86 pages
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2-blade and 3-blade 2-blade free propeller 3-blade propeller 3-blade shrouded 5-blade shrouded propeller A-weighted sound pressure A-weighted SPL acoustic angle Acoustic Data Aeroacoustic Aerodynamic characteristics ambient noise level angle and tip angles of attack condition m/sec deg deg deg deg deg deg kW diameter 12 directivity patterns Effect of blade Figure 17 figure 23 forward-flight conditions free and shrouded free propeller provided free-propeller noise levels general-aviation airplane ground board knots Langley Full-Scale Tunnel Langley Research Center m/sec deg deg microphone array microphone position NASA Noise floor number on static propeller arrangement propeller axis propeller operating propeller thrust propeller-blade angles Propulsor revolution speed Reynolds number rpm Sideslip Runs Propeller Velocity shown in figure sound pressure levels spectra static conditions static performance static tests static-thrust test propellers tests were conducted tip Mach number Tunnel Runs Propeller tunnel-operating conditions twin-boom unloaded tip variable-gain amplifier wall corrections