Re: Fixed vs folding prop
We recently switched from a 2 blade fixed to a 3 blade Max prop.. the difference is remarkable and percentage wise much higher in the light air 3-4 knot boatspeed range than the powered up 5-6+ knot range. We probably reach our optimum upwind speed now in 5 knots less wind than before, and can ghost along at 3-4 knots where 2-3 would have been it before.
The feathering props do away with the folders' reverse issues, and 3 blades is much less vibration under power too... but at a cost, of course ($$$)
1984 Fast/Nicholson 345 "FastForward"
".. there is much you could do at sea with common sense.. and very little you could do without it.."
Capt G E Ericson (from "The Cruel Sea" by Nicholas Monsarrat)