I flew mine with both a GMS .47 (weight is similar to OS .46 AX ) and later a Tiger Shark .52 without adding any weight to balance it and it flew great. It is very maneuverable so use expo on your transmitter to make it fly nice. I hated the landing gear on our grass field - it bends way too easily causing a propstrike - and I beefed it up but suggest that you use different gear such as aluminum. I also modified the tailwheel to protect the rudder servo. Its a fun plane. The TS .52 is a hot motor for it.