Some Thing Is missing in your sailing.;---? Why in the hell are you
worrying about a Prop in Bad Weather? You have more than enough Sail
Power and if reefed properly, a hell of a lot smoother ride.
My 2 Blade, Folder would stay open at 200 RPM but cavitation did worry
me. I don't think a 4 Blade fixed is going to help cavitation.
http://community.webtv.net/tassail/ThomPage