Don,

When I first looked at Bills airfoil, yes it did look very similar to the airfoil of the Vortex. However after fixing my midaired Vortex wing, and attempting to fit it to a Racer II fuze it wasn't really close at all.

Bill, may have used the Naca 66 as a basis for his airfoil but he obviously made some modifications to it. I don't even think I can make my racer II fuze sides fit this wing without a lot of work.