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Increase in BHP% with altitude

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JKunz

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SO, while digging into a 182RG manual a student noticed that BHP actually increases 2% for a given power setting (2400rpm, 23" MP) from 2000ft PA to 4000PA. It goes from 76% BHP to 78% BHP. I have a simple question....how?? I have always taught that for a given MP and RPM, BHP will decrease with altitude, engine management aside. what gives?

Same power setting, same leaning procedures, same everything. NA 0-540-J3C5D engine.

DO arrows show the same? I assume so, check your POH!

Ps.. there has been a lead that it has to do with the efficiency with the exhaust pressure at low altitudes, IDK

J
 

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