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Flyover noise characteristics of a tilt-wing V/STOL aircraft (XC-142A)A field noise measurement investigation was conducted during the flight testing of an XC-142A tilt-wing V/STOL aircraft to define its external noise characteristics. Measured time histories of overall sound pressure level show that noise levels are higher at lower airspeeds and decrease with increased speed up to approximately 160 knots. The primary noise sources were the four high-speed, main propellers. Flyover-noise time histories calculated by existing techniques for propeller noise prediction are in reasonable agreement with the experimental data.
Document ID
19740022310
Acquisition Source
Legacy CDMS
Document Type
Technical Memorandum (TM)
Authors
Pegg, R. J. (NASA Langley Research Center Hampton, VA, United States)
Henderson, H. R. (NASA Langley Research Center Hampton, VA, United States)
Hilton, D. A. (NASA Langley Research Center Hampton, VA, United States)
Date Acquired
September 3, 2013
Publication Date
August 1, 1974
Subject Category
Aircraft
Report/Patent Number
NASA-TM-X-3074
L-9037
Accession Number
74N30423
Funding Number(s)
PROJECT: RTOP 501-24-12-02
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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