Prop wash:
We're all familiar with this one, though it's commonly wrongly referred to as torque. This is the effect that causes large amounts of yaw during takeoff. It's caused by the rotating column of air moving backwards behind the propeller. When this column reaches the vertical stabiliser it pushes it to the side, turning the nose of the aircraft in the other direction. The pilot should use rudder to control it during takeoff. In real aircraft there is often a "Takeoff" setting for rudder trim that mostly compensates for it. You can work out this setting for your favorite aircraft and use it in the game too if your ride is equipped with pilot adjustable rudder trim.
http://forums.ubi.com/eve/forums/a/t...5111047273/p/1