three blade prop
I went from a two bladed folding prop to a three bald feathering prop on my C&C 34+. Backing was no longer a major concern. Boat vibration was much less with the three balded prop, and stopping was almost instintanious.
I did loose about 1/2 knot of boat speed with the three blade, but the trade offs were worth it. I used to dread backing out of a slip in a tite marina. I truly had no idea where the boat was going. The three blade feathering prop solved the problem with almost no drag under sail.