NASA/AHS Rotorcraft Noise Reduction program - Accomplishments at Sikorsky Aircraft

Helicopter external noise technology development since the initiation of the highly successful NASA/AHS Rotorcraft Noise Reduction program in 1983 is discussed. The effect of various blade tip shapes on two 9.4-ft diameter rotor systems investigated in NASA-Langley's 14 x 22 ft wind tunnel was...

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Veröffentlicht in:	Vertiflite 1989-01, Vol.35, p.68-73
1. Verfasser:	SHENOY, RAJARAMAK
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description	Helicopter external noise technology development since the initiation of the highly successful NASA/AHS Rotorcraft Noise Reduction program in 1983 is discussed. The effect of various blade tip shapes on two 9.4-ft diameter rotor systems investigated in NASA-Langley's 14 x 22 ft wind tunnel was determined. A noise reduction potential of up to 5 dB in BVI noise levels was demonstrated. Tail rotor noise characteristics, with and without empennage interaction effects, were also studied. (K.K.)
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title	NASA/AHS Rotorcraft Noise Reduction program - Accomplishments at Sikorsky Aircraft
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