Parameterized Propeller

This is a prop with hub developed in Openscad. I did this to find a method by which a prop could be designed in Openscad. It is still a work in progress and I do not pretend to be an expert in prop design. There might be another way to do this, it is rather complex, but it works and is a manifold.

The X axis iterates from the center out. At each Xn paired with Xn+1 verticies are calculated. The trick is to make sure the next iteration has the inside vertices exactly the outside of the previo