Re: Folding prop to Attalia
Best bet to get the proper blade will be to go direct to the manufacture of the blade you want to use, then they can spec it for you. My Arcadia, 2' shorter with the same 2gm motor uses a 2 blade 14" max prop. I can get hull speed out of it really easy. The pitch at least for mine, if I swapped out for a 3 blade would be the same, but you get more bite. So in rougher waters motoring against it, or a current, you should not lose as much speed per say.
If you are going to change out props, my suggestion is to bite the bullet and go for a folding/feathering prop, and gain upwards of .5-.7 knots of boat speed in most conditions. ALong with if you go with a max prop at least, reverse is way better than a fixed in reverse. IIRC close to 95% equal forward. Some of the other brands have similar increase/decreas forward vs reverse. Kiwi seems to be popular among those posting on the jeanneau-owners forum site.
She drives me boat,
I drives me dinghy!