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Investigation of the Muffling Problem for Airplane EnginesThe experimentation presented in this report falls in two divisions: first, the determination of the relation between back pressure in the exhaust line and consequent power loss, for various combinations of speed and throttle positions of the engine; second, the construction and trial of muffler designs covering both type and size. Report deals with experiments in the development of a muffler designed on the principle which will give the maximum muffling effect with a minimum loss of power. The main body of the work has been done on a Curtiss OX eight-cylinder airplane engine, 4 by 5 inches, rated 70 horsepower at 1,200 revolutions per minute. For estimation of the muffling ability and suppression of "bark" of individual exhausts, the "Ingeco" stationary, single cylinder, 5 1/2 by 10 inch, throttling governed gasoline engine, and occasionally other engines were used.
Document ID
19930091117
Acquisition Source
Legacy CDMS
Document Type
Other
Authors
Upton, G B
Gage, V R
Date Acquired
September 6, 2013
Publication Date
January 1, 1920
Report/Patent Number
NACA-TR-55
Accession Number
93R20407
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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