CG on 4*60
I finished a 4* 60 with a OS 91 FS and it balanced perfectly. The balance point is right on the main spar. The instructions advise to balance the plan while upside down. Also the control surface movements are: Elevator 3/4 in up and down, Rudder - 1 inch right & left and Aileron 5/8 inch up and down. Good luck.