I think I'm getting it now. So on the Seminole you have there, the windmilling prop represents a larger percentage of the total surface area, and would thus cause more drag? Am I right?

As to the point about blade design, well I have no doubt that modern blades are a bit more than small airfoils. Just look at the beautiful curves on the GE90-115B! I'm sure books have been written on the design of those works of art.