I used four servos on the ailerons, you could go with two no problem..I flew a 68" Christen Eagle at 17lbs with two futaba 9201's on the ailerons with never a problem. I used aluminum tube found in a airfoil shape (name ?) most hobbyshops carry this, solder a piece of 4-40 rod to each end for aileron attatchment. Attatch the rod link to a control horn on the trailing edge of each aileron just behind the strut. I also used 4-40 rods for tail braces on the pitts, with a gasser up front it helped with the balance, 2-56 would be fine. I flew my Pitts with (-) 1 degree on the upper wing and 0-0 else where. I never put down thrust into the engine as it did not need it.