No, you dont have to change it--just sand out the slots that the wing attach plates slide into when you start seting up the angle of attack. The angle of the attach plates can be changed by sanding on the attach pads that they rest on at the wing root. The diffrence in the angles will not matter that much----wood is very forgiving. "Steze" http://community.webtv.net/smlangford/StevesFlyBaby