Seb- As I suggested before, don't start out with a Cub for primary flight instruction. The CG Cub sometimes has a tendency to tip stall when it is real slow. You really need to start out with a trainer and a good instructor. Once you have built the plane(Cub), have an experienced pilot look it over and test fly it for you. I would hate to see you build a plane and then crash it right off the bat. A good engine for the Cub is about a .45-.46. Good Luck