Is there engine "torque" on take off in a turbo-prop single engine aircraft?

[On-MarkBob]

'P' Factor

'P' factor relates to the angle of attack of the aircraft Vs. the angle of attack of the prop. At high aircraft angles of attack, ie. low speed flight, the down going blade of the propeller will be at a higher angle of attack relative to its own airflow. Thus the thrust line will move outboard from centre towards the down going blade. This also produces a swing and thus requires rudder to compensate in the climb. Most of the effects of the airflow over the fuselage are already compensated for by the manufacturer or designer by way of offsetting the direction of the fin and installing the engine 'on-the-piss'. If you measure the tips of the prop to the leading edge of the wing on either side you may well find a difference, and if you look carefully at the fin you may well find it doesn't point in the direction of flight.
The 'P' Factor is responsible for twin engine aircraft having what is known as a 'critical engine inoperative' (shortend to 'critical engine' but technically incorrect!) The 'Critical Engine Inoperative' will be the engine that has the down going blade inboard towards the fuselage. If you loose this engine, then the thrust line of the other engine in now well outboard of centerline of the aircraft and thus the asymmetric problem is the most critical.

Bob