avia.wikisort.org - Helicopter

Power push-over (Buntover) is the action of an aircraft, typically a gyroplane, whose propeller thrust line is above the center of gravity and lacks an adequate horizontal stabilizer to pitch forward.

Power push-over is caused by the creation of a torque around the center of mass of the gyroplane by the force of the propeller and unloading of the rotor. Unloading of the rotor and subsequent power push-over can be caused by excessive pilot-induced oscillations.[1]

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