A giant stinger is a 20 lb plane and I sold one to a member in the club that has unlimited vertical with a g-62.And he is still flying this plane and I promise you if you have seen a g-62 on a 20 lb plane that will not go vertical without falling off there is something wrong with that engine.G-62's are used in great number's in warbirds that range in the 35 lb range and they fly great for what they are.Read rcign's thread on 50 cc vs 62cc.