A fellow club member once did an exact scale ( including airfoil )33% Sukhoi SU29. Great looking model but horrible at R/C aerobatics. It had to be forced to snap and spin. Took lots of elevator throw for the snaps that would kill almost all your airspeed. For the life of me I could not get a snap exit anyehere near the same line as the entry. It also had a wicked yaw to pitch couple. It was however a very tame airplane and the pwner actually used it as a sailplane tug. I once had an Aeroworks kit built Edge 540, the original one with the flat tail. After a conversation with Bill Hemple while building the airplane I was advised to sand the entire leading edge to a 1/16" radius. That was one of the best snapping airplanes I have ever owned. Every IMAC or pattern airplane I have built since then has had sharp leading edges.