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Sound-Level Measurements of a Light Airplane Modified to Reduce Noise Reaching the GroundAn Army liaison-type airplane, representative of personal airplanes in the 150 to 200 horsepower class, has been modified to reduce propeller and engine noise according to known principles of airplane-noise reduction. Noise-level measurements demonstrate that, with reference to an observer on the ground, a noisy airplane of this class can be made quiet -- perhaps more quiet than necessary. In order to avoid extreme and unnecessary modifications, acceptable noise levels must be determined.
Document ID
19930091991
Acquisition Source
Legacy CDMS
Document Type
Other
Authors
Vogeley, A W
Date Acquired
September 6, 2013
Publication Date
January 1, 1949
Report/Patent Number
NACA-TR-926
Accession Number
93R21281
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.
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