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If we assume that the selected propeller is designed to be most efficient at the designated cruise speed, then the required engine power is determined as follows: P Engine Cruise = P Req η P E n g i n e C r u i s e = P R e q η If we assume that the efficiency, η=0.85 η = 0.85, then we can calculate the engine power required. Power = thrust x time. Piston engine: engine produces power, fuel flow depends on power produced, power goes to propeller, propeller produces thrust. Jet engine: engine produces thrust directly, so fuel flow depends on the thrust produced. Those 3 arguments are perfectly clear. All engines: best angle of climb speed (Vx) happens when the excess. Prop's Output Power = Thrust x Pitch speed Thus, with a given power, the more thrust you have, the less top speed you get. Assuming the same power: Larger diameter & less pitch = more thrust, less top speed. (like the low gear of a car) Smaller diameter & more pitch = less thrust, more top speed. (like the high gear of a car).
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