Evidence suggesting that noise of full-scale helicopter rotors results mainly from unsteady flow; sound-pressure data and spectra for test conditions where gear train, engine and other propulsion system noises are minimized; tip speed (100 to 900 ft/sec) and disk loading affect radiated noise level.
Noise characteristics of helicopter rotors at tip speeds up to 900 feet per second
Acoustical Soc America -- J
Acoustical Society of America -- Journal ; 32 , n 9
1960
3 pages
Article (Journal)
English
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