I installed a 3D electric plane in my FMS sim called a Southern X. It will do knife edge cartwheels all the way to the ground! It's the funniest thing to see. I wonder if the real one will do it. I enter the maneauver like a regular spin. At altitude, throttle back and steadily apply up elevator to initiate a stall. At the moment the nose breaks the horizon, keep full up elevator and kick in full left rudder and full left aileron and this Southern X will flat spin about once and then start to cartwheel in a knife edge! It'll hold this attitude while losing altitude. To recover, just neutralize the controls. Craziest thing I've seen. I'd be a little reluctant to try this with a real R/C plane and not be able to recover from it, if it actually did it at all!

Jesse