I have been flying a Sig Clipped Wing Cub for 2 years now with an old Quadra 35. It is no light weight at 15lbs. Since I painted it and thought "heavy" when building the tail it balances just fine. It is overpowered for a Cub but not terribly. I already had the engine, but if I were to do it again I think a 25 or 26 cc engine would be better. Mine has a Bennett exhaust deflector, wow is it loud. I really like flying it but I wish the guys would stop yelling "timmmmmberrrrrr"