Power Push Over

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.