Non-level flight

[ruxtmp]

This is the Torque effect that you are seeing. Trimming (if available on aircraft) will reduce the load that you must apply to the stick and rudder to maintain level and coordinated flight.

On a side note I noticed that most of the flyable planes seem to have low dynamic directional stablility. This produces the highly annoying back and forth swinging when using the rudder as the nose hunts out the equilibrium point. While I have never flown any of these aircraft it seems odd that they would respond to control inputs and atmospheric distrubances in this manner.