The rudder is square to everything else around it so its is odd. My only thought is that the motor is mounted wrong. Maybe with left trust. But the way its st up is the gear box has a square slot in it and you slid it onto a peice of wood that isnt really fastened down. When I go full throttle the wood twists and the motor moves to the right. It does not appear to have any left trust though. So I really dont know what it is.