Helicopter far-field acoustic levels as a function of reduced main-rotor advancing blade-tip Mach number
By: Arnold W. Mueller, Charles D. Smith, and Phillip LeMasurier.
Contributors: Smith, Charles D., 1936-; LeMasurier, Phillip.; Langley Research Center.
Series: NASA technical memorandum -- 102684.
Publisher: National Aeronautics and Space Administration, Langley Research Center
Published: 1990
Place of publication: Hampton, Va
Language: eng
Format: Microform
Subjects: Helicopters -- Noise control.
Other titles: Helicopter far field acoustic levels ....
Notes: Distributed to depository libraries in microfiche.

Microfiche. [Washington, D.C.? : National Aeronautics and Space Administration], 1990. 1 microfiche.