I'm building a Magician from a Walter rib kit. I took the rib spacing from a Midwest plan, the wing measures just shy of 48". Guess this will be a Midwest version, given the wing length. I am making the flaps moveable. Powering the plane with an FP40, which will be tuned in the usual Philly Flyer way. I'm also increasing the stab to cg moment by a couple of inches. My thought is that, if the Magician turn and corner is not improved by use of the flaps, the flaps are overpowering the elevator, slowing the turn. Pitch movement of flaps throwing the plane opposite to the direction of turn while, at the same time, increasing lift in the desirable direction. A fellow earlier in this thread set the ratio of flap movement to elevator movement at 50%. This would serve a similar function seems to me. So, I'll see what I've got in a few weeks. Ken Cook, a club member, loves his Brodak Magician, the original configuration, powered by a .25. No moveable flaps. It's one of his favorite planes. Guess we're hitting one of those CL phenomena. A design that out performs specs. Like Flite Streaks and (Giseke) Noblers, some designs just work right. They are in balance. I may be upsetting this inherent design balance, by going to moveable flaps and a heavier more powerful engine. The rib design of the Magician, for one thing, is on the thin side, thinner than a Twister, for instance. I built a sort of Fancherized Twister a few years ago. Powered it by an FP40. Very nice match. When trimmed out (finally) it did nice rounds and corners. Even tho it hit the scales at a porky 46 ounces. The Magician should be lighter. Much better wood. However...