That size plane begs for the right sound too. Sheldons Hobby recently had Enya .90-4c for less than the same size magnum. Enya engines last a very long time. The Fox .60 was the highest powered .60 2 cycle in a recent M.A.N. shootout. Their .75 uses the same design and weighs no more. (it will be inside a cowl won't it?)