As one who has recommended and uses a .46 2 stroke in this plane, I must be more specific and say "a high performance ball bearing .46" such as an OS 46 FX, OS 46 AX, or TT 46 pro, not a bushing bearing lower output enging like an OS 46 LA. There is a great difference in what a .46 Ax will fly well and what a .46 LA will fly well. The 46 LA is a fine little engine but would "meet it's match" in this airframe!