How many more gallons per hour is required to fly extra 1kg of weight on a Diamond DA62 aircraft or similar aircraft?
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1Have you looked for the Pilot Information Manual (PIM) for the plane? – SMS von der Tann Oct 13 '22 at 19:46
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You'd need the fuel consumption and cruise performance charts for the plane and extrapolate the number from the speed penalty you incur from an increase in weight from x to y. Normal cruise power is 75% of maximum. You might find that at a 75% power setting at a minimum weight, each extra kg costs you some fraction of a knot in cruise speed. Work out the increased power required to maintain that speed, and the fuel burn from that power increase, and there you are. – John K Oct 13 '22 at 19:53
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Related for jet aircraft: How much does it cost extra to fly with one additional passenger? – Bianfable Oct 14 '22 at 07:00