Sounds like it still has a slight warp in the wing. If so, use a heat gun at low temp (I lay mine on the workbench with the switch clamped or rubber-banded on), gently twist against the warp and pass the wing in front of the gun slowly a few times. Keep holding while it cools. It may take a few tries, but go slowly and it should straighten. <div>Make sure the motor has the correct right thrust if called for. Easily corrected with shims or washers. </div><div>The smaller the ship, the greater the impact of small changes. </div>