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Factors affecting the noise from small propeller driven aircraftThe factors affecting noise from small propeller driven airplanes are reviewed to quantify their affects where possible, and to indicate the potential for noise reduction. The main sources of external noise are noted to be the propellers and engines; the airframe being of less importance for both aural detection and community annoyance. Propeller noise is a strong function of tip speed and is affected adversely by nonuniform inflows. Reciprocating engine exhausts are noisier than those of comparably rated turboshaft engines, but their noise can be reduced by the use of flight certified exhaust mufflers. Presently, there are no generally accepted engineering methods for development of optimized propellers and exhaust muffler designs from weight and performance penalty standpoints. Flight demonstration results, however, suggest that required noise reductions for future certification should be possible with potentially small penalties.
Document ID
19750052586
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Maglieri, D. J.
Hubbard, H. H.
(NASA Headquarters Washington, DC United States)
Date Acquired
August 8, 2013
Publication Date
April 1, 1975
Subject Category
Aircraft Design, Testing And Performance
Report/Patent Number
SAE PAPER 750516
Meeting Information
Meeting: Society of Automotive Engineers, Business Aircraft Meeting
Location: Wichita, KS
Start Date: April 8, 1975
End Date: April 11, 1975
Sponsors: Society of Automotive Engineers
Accession Number
75A36658
Distribution Limits
Public
Copyright
Other

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