I agree, normally if you need to trim out a wing warp with aileron you get the plane going out of trim at different speeds like at the top and bottom of loops or on landing but my plane tracks better than any other I have had at all speeds and does climb absolutely vertical and rolls vertical too. I did use the offset supplied on the motor mount and its perfect for my OS 91FX with genesis pipe, tracks like an arrow on take off. Incidently I can prop hang at 1/3 throttle, with 10% nitro and a 15x8 prop. Never had a plane that accellerates vertically like this one does either, most get slowed down by weight and drag.