Matt, I'm very interested in reading any respondes to your query as well. My last cruising boat
had (still has) a prop made by the Japanese. I have tried to get info as to where to get a similar one because it was the best compromise for a fixed (as opposed to feathering) three-blade prop that I have experienced.
The Campbell sailer prop looks similar yet I cannot tell without a side view. That Japanese prop has thinner longer blades like the Campbell and, when viewed from the side, you could see that the blades are swept back. so, in addition to the usual pitch
and diamater one needs to be concerned about the cord length in proportion to the total "wing" length as a ratio along with the amount of sweep back (similar to dihedral on a wing?) angle.
The overall result was a much lower drag as compared to the same pitch
and diameter of the usual power boat
prop, and great power upwind and against the seas and a good bite going in reverse. I cannot truly say that the prop walk was a lot less because it is on a heavy boat
with a very good rudder
and underbody which facilitated turning in both directions very well anyway and I would need to put the usual powerboat prop on to make a comparison.
I did play with letting the prop rotate under sail versus stopping the shaft. For sure the drag was less at high hull
speeds when the prop was not allowed to rotate, just like most predictions made by the engineers. It was more difficult to tell under two or three knots yet the engineering predictions say that the drag is still higher all the way until the stiction causes the shaft to stop.