I saw a Pizzaz with a .91 Saito. It took off in about 2 feet. Most of the time the guy flying it would be running at about 1/2 throttle. He was wringing it out one morning and I left to go get a cold drink at the 7-11. Gone 10 min. and when I came back, the tail was sticking out of a trash can. I think the .91 Magnum would work fine on the Twist. Run it back close to the firewall, and maybe not have to add tail weight. FYRWALKER, how about some pics if you do the .91?