On our last boat we went from a 2 blade 18x16 Martec folder to a 3 blade Campbell Sailor prop - and were surprised to have Norm (a great guy, btw) at West By North recommend a 17x11... but the prop worked great for us, much smoother under power, good "brakes" but of course a bit slower under sail.
When the time comes to reprop, if we can't spring for a folder/featherer we'll do the Campbell again... but currently leaning toward the Kiwi prop - also available from West by North.
".. 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)
1984 Fast/Nicholson 345 "FastForward"