I looked at the notes I had with the MoI example and it is out of date. I made that before PROP_DESIGN_OPT. So that was the geometry I manually iterated on. Whereas the new geometry was automatically iterated on, so it should be better. However, the MoI example does show how the blade geometry should look in general. As far as the smoothness and quality of the ler, ter, and the blade shape in general. As far as the hub geometry and things like that, the user should make his own based on FEA and their own manufacturing desires. What is in the MoI example is just something I was interested in. There are no propellers that use such a hub retention geometry.