I had an OS 46 fx in my Miss America version, it was running a 10x7 prop and it hauled A$#. The retracts held up well on my grass field. This plane flew great with the engine and if you mount it sideways all that will need to stick out is the cylinder head and carb opening, no muffler or anything else. No overheating problems either. It might just be me, but a 4 stroke engine doesn't sound any better, just different a 2 or 4 stroke engine that is less than 1 cu in. will sound like a little model no matter what. I live in Oklahoma and I was very comfortable flying this plane in 20+ mph winds with my setup. All in all it is an excellent plane, capable of tons of maneuvers.