My flying partner has this plane w/ an OS .61FX on it.The airframe is very light but built very strong.It weighs between 3 and 4 pounds minus engine and radio.It isnt terribly overpowered with the 61.The wing is relatively thick and the control surfaces are pretty big.Personally the only 46 I would consider would be the OS .46AX,other than that,Id put the 61 on it.It balances out without additional weight needed.The box says powerline then it also says Green Models or something close to that.Nice little plane with 2 piece wing and decent landing gear.