I have a few questions, I just acquired a .60 size that I am installing a Saito 100, Cline System, and a 15 x 6 prop. My main concern is with the CG. Where would be a good place to start the CG for beginner/intermediate 3d? I have heard that the suggested location from GP is not that great for 3D..

Also, is it necessary to open a hole in the front of the cowl for cooling?