I was thinking more of a light weight plane bearing 60 with a Mouse Can Muffler to put in a 40 size fun fly plane. I am actually thinking of an Extreme 330. A friend has one with a GMS 61 and it flies great but I want a lighter weight engine for this or some other 40 size plane. I think a lot of the planes are underpowered for torque rolling. The big Cardens, etc. JUMP out of a torque roll and most of the planes I see that can torque roll can pull out vertically but just barely.