prop help

[bigshrimpin]

Originally Posted by wpearch

what or who is fishbone? will a merc prop fit an omc/

I've never put one on . . . but I know Merc has an OMC FloTorq-II hub kit . . . so it'll fit. You can contact any of the merc prop dealers and they'll tell you exactly what you need.
EBay/craigslist are great places to pickup a prop.

Just b/c a prop is stainless and the same pitch as an aluminum prop . . . don't mean nuttin. I ran a Brand New Michigan rapture 17pitch stainless on my merc 225 and could only hit 42mph (same boat, same day) I swapped with a banged up stock yamaha aluminum 19pitch gained 300rpm and the boat hit 48.5mph.

There is so much difference b/w the shapes, rake, blade area, thickness, etc . . . You really have to play around with a few to find the right one for your boat. Before you start messing around with props . . . make sure you have your motor height optimized. The cavitation plate up a one or two inches from the bottom running surface, but not too high that your blowing out. Make sure Trim Tabs at least 1/4" from the bottom running surface . . . These changes can make several MPH (and GPH) difference on your rig.

Always prop the boat so that the motor can hit the high end of the recommended RPM range with a full load.