I just orderd one of these little ships should be in just after X mas. But I am currently flying a WASP that was wayyyyyy nose heavy so i removed the Irvine .53 and put in a OS.32 SX running a 11-4 prop and I still had to add tail weight to it. But all up weight is 3 pounds 12 ozs. It will hover but will just barely move to pull out if at all. So I am sure good .40 size engine plus will make this plane pull out of vertical like a rocket.