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Trim is what keeps the aircraft stable without so much use of the joystick. Trim can be set by pressing A on the gamepad. There will be no indication that trim is set when you use it. You can only feel it. When you set the trim, it will lock the plane's current roll and pitch and keep it that way. If your planes tends to roll in one direction after leveling it out and setting the trim, try applying the rudder in the opposite direction of the roll. The roll is caused by the torque of the engine, which make the plane tend to want to turn with the propellers