Hi Bill - No flak jacket required. I agree that more flap travel is the setup for a heavy airplane, with 1:1 flap - elevator travel. BUT, for a classic airplane with a short tail moment (Chief, Nobler, etc.) more elevator travel is required. The reduced tail length makes it necessary to increase the elevator travel and hence lift to generate the same turning moment. With equal flap/elevator travel, even light short tail airplanes don't turn well at all. From level flight, they seem to rise while pointing in the original direction, and after 10-20 feet of flying this way, suddenly turn all at once. Pro stunt? Not hardly. What I don't know about is how to set up an airplane which is both short tailed and heavy. Certainly pushing the CG as far aft as is stable is the first step, and then modify the control throws. Comment welcome. Tom H.