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Fuel economy power settings

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Aircraft Systems

When an aircraft manufacturer says the aircraft will burn x gals of fuel per hour at 65% power, what rpm or m.p. do I use to set power at 65%?

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1 Answers

  1. John D Collins on Nov 08, 2014

    For rich of peak EGT operation, the performance charts found in the POH are used. They will specify the conditions such as RPM, MP, altitude, temperature, and leaning technique to obtain the desired power. They may provide more than one option,

    With lean of peak operation, one can use a wide variety of MP and RPM and establish the power setting by setting the fuel flow rate as power is directly proportional to fuel flow rate and largely independent of MP and RPM when operating lean of peak EGT. Not all engines can be smoothly operated using lean of peak, particularly engines that use a carburetor.

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