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Ski prop 37 mercruiser

azpapa

New member
"I know there have been posts

"I know there have been posts very close to this before - but I just bought the boat and don't want to guess and blow up motor. It's a 19' Rinker with a 3.7 Mercruiser and an Alpha One I/O. The three blade prop that came with it has the markings 48 78 20 A40 19P. At wot it hits 4000 rpm and 40 mph. The specs say the motor should be at 4200 - 4600 rpm at wot. It had a heck of a time trying to pull a skier up (our primary reason for the boat). I understand it may have the wrong prop on it for this purpose and I should probably go with a 4 blade. If so, what size/pitch material? Thanks for helping this begginer. ( my kids thank you also."
 
"Don't know if you need 4

"Don't know if you need 4 blade, but a 17P would be what you want to raise the WOT rpm's a bit and get a better holeshot"
 
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