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Variation of horsepower with altitude (airplane section, s & a branch)

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asic092_ocr.pdf (6.312Mb)
Date
1920-08-30
Author
United States. Army. Air Service. Engineering Division.
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Description
The most serious difficulty in theoretical analyses of airplane performance arises from a lack of reliable data on the variation of the horsepower of the propulsive system with altitude. An empirical-theoretical solution of this problem has been given in McCook Field Serial No. 1221 and should serve as a close approximation. In this report an engine-propeller factor is derived which expresses the ration of the horsepower available from the propulsive system at any altitude to the horsepower obtained from the engine at the ground with a propeller of 100 per cent efficiency. The factor curve gives a picture of the drop off in propulsive efficiency with altitude. In this document, curves for the Liberty "12" and the Hispano-Suiza "300" engines are given.
URI
http://hdl.handle.net/11200/49068
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