[ArcticViper]

all of the above is "correct" but just to set the record straight... It's not torque that's counteracted by the rudder... that's a phenomenon called "P-Factor" It arises because the propellor generates most thrust on the downward blade motion (from top to 90degrees) thus creating an inbalance in forces over the propeller surface and therefore yaw towards the opposite side. (Yaws left for single engine clockwise rotation aircraft) The same rule applies to multi engine aircraft, unless they have counter rotating propellers.

Torque acts on the aircraft in flight by trying to roll the aircraft in the opposite rotation direction of the engine/propeller.

Lots of people get this wrong, and to be honest it's an acceptable mistake to make, because aerodynamics and/or flight dynamics aren't exactly common knowledge. :wink: