As part of this discussion, I am also wondering about L_R thrust. I am flying an newly built Goldberg Extra 300 with an OS 1.08 engine 15x8 prop. When I pull into a vertical upline as the plane goes up vertically, I must continue to add L rudder to keep the vertical straight. The higher the plane goes( and the more it slows down], the more rudder I must add. Is this an indication of the wrong thrust angle or what is causing it?