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- W217644169 abstract "The rate of change in power of aircraft engines with altitude has been the subject of considerable discussion. Only a small amount of data from direct measurements of the power delivered by airplane engines during flight, however, has been published. This report presents the results of direct measurements of the power delivered by a Liberty 12 airplane engine taken with a hub dynamometer at standard altitudes from zero to 13,000 feet. Six flights were made with the engine installed in a modified DH-4 airplane. The experimental relation of brake horsepower to altitude is compared with two theoretical relations and with the experimental results, for a second Liberty 12 engine, given in NACA Technical Report no. 252. The rate of change in power with altitude of a third Liberty engine, measured with a calibrated propeller, is also given for comparison. The data presented substantiate the theoretical relation of brake horsepower to altitude based on the correction of ground level indicated horsepower for change in atmospheric temperature and pressure with the subsequent deduction of friction horsepower corrected for altitude. (author)" @default.
- W217644169 created "2016-06-24" @default.
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- W217644169 date "1929-01-01" @default.
- W217644169 modified "2023-09-27" @default.
- W217644169 title "The Variation in Engine Power With Altitude Determined From Measurements in Flight With a Hub Dynamometer" @default.
- W217644169 hasPublicationYear "1929" @default.
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