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I'd say around 3%/1000ft. (m) (archive)
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Posted by Stepan on February 11, 2001 at 22:54:15:

In Reply to: horsepower loss? posted by tim on February 11, 2001 at 22:25:20:


Could someone explain/inform about HP loss at altitude? I live at 3600 ft and regularly drive above 7000 ft. Prevously there was something mentioned about a 10% loss per 1000 ft of altitude. Any info is apprecaited. Thanks-

Air density decays exponentialy with altitude and is roughly zero at 10km. To get rough estimate assume linear decay. This yields 10%/1km or 3%/1000ft. Since engine power is proportional to air density you might assume 3%/1000ft loss. Again, these are rough estimates and I am sure there will be a wise ass to argue about percentage of a percent.;-)

Stepan


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