Noise characteristics of eight helicopters
By: Harold C. True and E. J. Rickley.
Contributors: United States. Federal Aviation Administration. Systems Research and Development Service.; Transportation Systems Center.
Series: Report - Federal Aviation Administration, Systems Research and Development Service ; FAA-RD-77-94
Publisher: Dept. of Transportation, Federal Aviation Administration, Systems Research & Development Service; for sale by the National Technical Information Service
Published: 1977
Place of publication: Washington; Springfield, Va
Language: eng
Number of pages: 153
Subjects: Rotors (Helicopters) -- Noise.; Helicopters -- Flight testing.; Noise -- Measurement.
Notes: Cover title.

"Acoustic data acquired and processed into format by the Noise Measurement and Assessment Laboratory, Transportation Systems Center, Cambridge, Massachusetts."

Report date: July 1977.

Bibliography : p. 153.