RCU Forums - View Single Post - Is it me or the air that is dense

06-21-2003 | 01:33 AM

#11

Tall Paul

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From: Palmdale, CA

Is it me or the air that is dense

"Cm on guys -I will even accept formulas --"
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Zey are eqVations!... Chemists work with forumulas!!!

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Ok,
"Without supercharger, or with a sea-level supercharger, the indicated horspower is approximately proportional to the density of the in which the engine is flying and hence drops off markedly with increasing altitude. Since the friction and blower power does not drop in proportion to the air density (sigma) the reduction in power with altitude is accentuated. For an airplane engine in which the friction torque Qf is 13 percent of the sea-level torque Qo (which is typical), the variation of full-throttle torque with altitude is given by...
Qalt/Qo=1.13sigma -0.13"
*
"Technical Aerodynamics, K.D. Wood, 3rd edition, 1955

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