Aviation Glossary - Power Torque Over

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Power Torque Over

A situation whereby the torque on the airframe by the engine causes an uncontrollable Roll-Over upon loss or rotor thrust and control at low g or zero g load on the rotor. This is the roll equivalent of a Bunt-Over in pitch. In many accidents, it would be difficult to determine that PTO, rather than PPO or Bunt Over, was not the final mechanism of the accident. In all cases, the results might be exactly the same – severe extreme blade flap, precession stall, impact of a rotor blade on the airframe, and/or separation of the blades in flight. Avoidance of low-G maneuvers reduces, but does not eliminate, the risk of torque-over in a susceptible craft. The propensity for a possible PTO in any gyro would be dependent on the torque produced by the engine, any torque compensation or aggravation from the airframe aerodynamic configuration, and the inertial reaction of the airframe.

source: Glossary of Gyroplane Terms

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