When you draw a curve at the intersection of the blade and hub the curve is not at the intersection. Same goes for the trim. The orange and green surfaces are the result of trimming the blade with hub (shown in blue). Before trimming I also tried having a curve at the intersection of the blade and hub and it comes out exactly where the trim does. My main goal is to smoothly blend the blade into the hub. The exact geometry and dimensions aren't too important so long as it looks right. Then trim the remaining blade and do a polar array of that geometry to make the whole propeller.

Edit; Attachments have been removed to save server space.