Need help w/ airfoil choice for large scratch built airliner MD-90. Wingspan will be a little over 8 feet and built of foam. I have the airfoil number for the real thing but have no drawings. Should I use the actual airfoil or substitute another more suitable to a large scale model? I would like a well behaved airplane. In addition to the wings, what airfoil should be used for the tail surfaces? I don't have an airfoil number for these.