I have one with a Thunder Tiger .91 four stroke. The plane flies fine. Knife edge has some belly tuck. Work that out with elev. mixing. It will hover for a second or two then falls off. It is not designed for 3D. I'm working on flat spins with it trying to find the right combination. It flies great inverted. It's at it's best doing loops, 4 point rolls, split S, figure 8's etc. (pattern stuff). Dead stick is no treat. It hunts the ground fast. If the engine quits glide it straight out and keep a steep angle of descent. DON'T try a slow turn the wing tip will dip and in she goes.

*note: check your firewall, mine was hot glued in and broke loose.