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Propeller Principles. Consists of two or more blades and a central hub to which the blades are attached.Propeller blades produce forces that create thrust to pull or push the airplane through the air.. . Propeller Principles. The engine supplies brake horsepower through a rotating shaft.The propeller converts the brake horsepower into thrust horsepower.Propeller efficiency is the ratio of thrust horsepower to brake horsepower.Propeller efficiency depends on how much the propeller
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