RE: ACE foam wings
An NACA0013 would be a great airfoil on that little Ultimate. I guess the key aspect of a good design with a fully symmetrical airfoil is wing loading. It is imperative to keep them light and then they really come alive. The main bonus of the Ace wing though is how easy they are to build. They would certainly do a little better if they had a spar installed as well. they are just not stiff enough to be precise.