Didn't have to add any wash out to mine. Built on a solid surface so the wing was true. I only sheeted the top of the leading edge and had no problems. Initially I had a 15 on it and the first flight snapped the horizontal stab in half during a dive and pull out. Landed the plane on half a stab with no problems and built a stronger one. Flew the crap out of it and then tried a norvel .074 on it with a 7x3. 6 ounces lighter and even better performance!! All up weight with 2oz of fuel was 20oz and that was 4 channel with everything operational. Fantastic flyer and no problems with tip stalling. I have a ACE mustang that is just 3 channel (ail,ele,throttle and handlaunch with no landing gear) which also has a .074. Weighs in at 18oz with fuel. That plane is quite a bit faster than the texan because the ace kits have a semi-semitrical wing where the texan is a flat bottom. However, at mid to slow speeds the texan will easily out manuever it becase the texan is so stable.