Flex-O-Fold 3 Blade
We have a Flex-O-Fold 3 Blade prop, and we find that it gives us plenty of power. We can get up to 6.8 to 7 knots on the engine. We are also happy with our sailing performance. I have heard estimates that a folding prop will gain you anywhere from .5 - 1 knot in performance. Obviously the 2 blade folding props allow for less drag than the Flex-O-Fold 3 blade, but may be less powerful under engine - and maybe more issues with prop walk.