A .46fx would be too much weight, too much vibration, and too much torque for a menace. I have flown 2 Menaces to death literally wore them out, I know quite a few people who have had a lot more than 2 menaces, none of them would recomend a .46fx. If you have to have a menace, or a Minus from Turner performance products, an engine under 10 ozs is what you are looking for. Webra speed.32, Os.32sx, TT Pro.36, Os fp.40, OsLa.40,.46, There are a few more light weight motors out there that would work, but these are a reference for what would work on a menace.