The Murphy Builders Site

Phil, what is your fuel burn in cruise?

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Phil, what is your fuel burn in cruise?

PETE
At 4800 RPM engine 2300 Rpm prop I burn right at 5 gal. an hour. I can get it below 5 gal per hour at 4600 RPM engine 2200 RPM prop.
Phil&Lisa Smith
#460R
N414D

You can use that fuel burn rate to estimate the actual horspower you are putting out in cruise. Apparently most internal combustion engines burn about .5 lbs of gas per horsepower per hour. Your US gal weighs 6lbs so you are burning 30lbs per hour Divide by .5 = 60 hp.

You can use that fuel burn rate to estimate the actual horspower you are putting out in cruise. Apparently most internal combustion engines bu rn about .5 lbs of gas per horsepower per hour. Your US gal weighs 6lbs so you are burning 30lbs per hour Divide by .5 = 60 hp.

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