torque effect

torque effect
The reaction on a vehicle of the torque applied to the propeller or the rotor, which tends to rotate the fuselage in the opposite direction to the torque force. In helicopters, it is countered by the tail rotor. In propeller-driven aircraft, rigging trim tabs on control surfaces or offsetting control surfaces counter the torque effect.
Counterclockwise blade rotation causes the torque couple to attempt to rotate the fuse-lage clockwise around the rotor mast.
The anti-torque rotor produces the thrust required to oppose torque.

Aviation dictionary. 2014.

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