A.T.
Science Advisor
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When you engage the propeller the wheels also start braking. To get any "extra energy" by engaging the propeller you have to multiply the wheel force, to get a greater prop thrust. It's the net force resulting from the gearing that determines if you accelerate (gain energy).chingel said:I mean extra energy compared to when the propeller is not spinning. When you engage the propeller, the wind also works on the propeller blade that is turning.