[Tempest123]

If it is unwanted rolling motion you're referring to, this is normal, it has to do with trimming the ailerons to counteract the torque of the propellor, doing this depends on the plane type. Most of the russian, british, japanese and german aircraft (fighters) do not have adjustable aileron trim in flight, they had aileron trim tabs that where manually adjusted on the ground. Several of the Italian aircraft (Macchi's) have unequal wing lengths (i.e one wing longer than the other) to counteract torque. The American planes tend to be larger and more complicated, and therefore they have adjustable aileron trim. Try it for yourself: take a Bf 109 or Spitfire up and notice how you cannot adjust the aileron trim, then take a Mustang or Corsair and notice how you can adjust it.

There is no perfect aileron trim setting for all power settings, so in the middle of a dogfight don't worry about it. Elevator (pitch) trim is much more important to proper flight, and most of the aircraft in the sim have adjustable elevator trim, except for earlier planes like the i-16. Properly used elevator trim will allow you fly without fighting the stick, and you will gain speed and be able to hold altitude better.

On takeoff, the larger propeller and small fuselage of the WWII types causes lots of torque sideways, so before takeoff, you should trim your rudder left or right to counteract the forces, and use rudder on takeoff to guide your aircraft straight down the runway. In real aircraft the rudder is as important as the control column, and its difficult to control using the keyboard. If you think you will enjoy Il2 for a while, buy a set of rudder pedals, it makes a huge difference. Hope this all made sense, most of the forum members here are very helpful, so don't worry about asking questions.