Get Compufoil. This program will take the root, tip airfoils selected and produce all the airfoils in between. You specify spacing etc. At the size of our little airplanes, any symmetric airfoil will do just fine. Just stick with the chord and thickness of the original. In my design work I typically use NACA 00xx airfoils with about 12 to 13 Percent at the Root and 10% thick at the tip. Then, I set the max thickness to about 35% of the chord. All this can be done in Compufoil. [link=http://www.compufoil.com]Compufoil Web Site[/link]

Good Luck

Ken B