I actually built a free-flight autogyro, 1/2A size, in my misspent youth...never got it to fly hardly at all, though. Looking back at it, it was severely underpowered. Don't get your hopes up, it doesn't really intrigue me--looks like a whole lot more trouble than it's worth. Besides, by principle they won't fly inverted--in order to do so, the rotor would have to stop and rotate the opposite direction. I don't think that's happenin'. And if a plane won't stunt, I have no interest in it. Even when I competed in RatRace, I was the pitman, not the pilot. Too boring.
--Ray