This wing was designed many years ago by Kerry Kaifish, who worked with NASA, and was familiar with aerodynamics. I bought a set of his wings, which came in different sizes, but haven't used them in years. I am thinking about playing around with them again.
I know aerodynamics aren't the same as hydrodynamics, but thats about all I know. You can see he squared off the edges which he said created less drag. He also added the dimples, similar to a golf ball, which also created less drag.
I became curious again about these wings when I got my VW and noticed the squared off edges.