I agree with rotaryphile on incidence. Dave Patrick set up the Cermark Pitts 0-0-0-+2 on the stab and the airplane flies beautifully. But that's with a symmetrical airfoil; anything else, I'd say all bets are off. Good luck.If God had intended airplanes to have one wing, Curtis Pitts would have built them that way! How about an all-biplane get together sometime, somewhere? How's that for vague?