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acoustic advance ratio airfoil angle of attack axial directions azimuthal color-coded contour plots counter-rotation propellers CR propeller decibels Effects of Installation experimental study four blades four-bladed propeller four-bladed SR propeller fourth harmonic given in figure harmonic levels helical tip Mach high noise high tip speeds high-tip-speed data i i i i I i i i i increase in noise Langley Research Center low tip speeds low-tip-speed measurement range microphone carriage microphone locations monics nacelle NASA noise increases noise levels noise measurements noise radiation patterns nonzero pitch number of blades OASPL peller propeller axis propeller disk plane propeller installations propeller noise propeller operating conditions propeller plane propellers and counter-rotation pusher installation pusher propeller pylon pylon-mounted reference row of blades second harmonic shown in figure sound pressure level spatial sting-mounted tions tip Mach number tip speeds runs tractor configuration tractor installation Turboprop unsteady loading operation wake yawed