Get the Great Planes Giant Big Stik. It's good for anything from a 22cc up to about 45cc. I have a Poulan 42cc on Gas/Glow in mine. It rolls about 15 or 20 feet on take off, and then will climb vertically. (And that's with an 8" pitch prop!!)

I built mine with the flaps, but later took out the flap servos and joined the flaps to the ailerons for more roll response. (I like a really fast roll rate.) Besides, it lands very slowly and hardly needs flaps. We were flying the other day in a 10 to 15 knot wind, and it was landing like a helicopter!

AV8TOR