Hello, everyone..I tried doing a search to see if it was asked before with no luck so I'll ask now. To Anybody that made their own rear wing/etc. what airfoild profile did you use? I have been looking at different profiles to use and saw the Selig S1223 has the highest CL that I could find. Does anybody know of an airfoil that has a higher lift coefficient? Here is a link to a website that shows the CD/CL vs angle of attack. The site allows you to print the profile, which I would use to make the  foam core's profile.

A common way of making a mould (or initially a pattern) for aerofoil profiles is to use a hot wire technique in polystyrene foam. It requires a steady hand (and a friends help for big wings) to slowly cut the profile in a uniform way.

Warren Penalver
Easy Composites / Carbon Mods - Technical Support Assistant