RE: engine for 4*40
46 SX I thought it was FX. Is that a new motor. I have a Os 48 or 56 on mine. Runs great. Aweosme power and hovers with 30% Nitro. Good luck with your plane man. I wish I could seel me, but seeing someone gave it to me I'll give it away someday. O well Good Luclk man...You will love the plane
Dan