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Inplane acoustic pressure with Ytail Vtail and Itail installed
Upstream acoustic pressures with Ytail Vtail and Itail installed
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10-Foot Wind Tunnel 11 BLADE-PASSAGE HARMONIC 6500 FREQUENCY acoustic pressure aerodynamic airfoil Ames Research Center angle of attack background noise blade interactions blade loading blade-passage frequency BLADE-PASSAGE HARMONIC Figure blade-passage harmonic noise blade-passage noise Block and Gentry computed direction dorsal fin Effect of Y-tail empennage and propeller empennage surface empennage trailing edge empennage wake empennage/propeller spacing Filotas floor reflections fuselage harmonic levels harmonic noise levels harmonics of blade-passage higher harmonics Home and Soderman Hz Figure increased INPUT interac interaction noise Larrabee and French m/sec Mach number measured microphone 12 monics NASA noise decay noise measured normalized peak peller propeller blade propeller interaction propeller noise Propeller-alone noise pusher propeller radiated noise relative rotational speed ROTOR shear layer shown in figure spacing between empennage strut SUBROUTINE TAIL test section three empennages turbulence unsteady blade-loading wake deficit wake turbulence wake width Wilby wind turbine windspeed Y-tail