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Another thing I'm puzzled about: this time power settings and altitude.
OK. These numbers are based on an extract from a power setting table for a
Lycoming 180HP :- For 55% rated power with a FF of 7.4G/h at SL with an RPM of 2100, the MP is 20.9. For 55% rated power with a FF of 7.4G/h at 12,000 ft PA, again with an RPM of 2100, the MP is 18.2. I understand (and please correct me if I'm wrong) that fuel flow has a linear relationship to power, i.e. a certain fuel flow will produce a certain amount of power. Therefore, the FF figure of 7.4G/h producing 55% at both alts is consistent with that understanding. However, what I don't understand immediately is why at altitude the MP required is only 18.2 rather than 20.9. Anyone have a simple explanation? Thanks in advance. I'm working on the "no stupid questions" maxim here.... although some of this stuff makes me feel like a moron from time to time. |
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