I purchased a plane hanging from the ceiling of my lhs ( a 4 stroke). Whoever built it put 0 right thrust in it, WOW I never would have thought it would have made that much of a difference. At times, on low rate it takes full right rudder to make up for it. This is my first 4 stroke maybe even with proper right thrust angle it will still pull. What do you think? I'm going to shim the motor mount and see how much it helps.