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I just bought a used 14 ft aluminum john boat( LOWE). I also bought a 1984Yamaha 30 hp (model 30 sh) whatever that means. Anyway, the prop (9 7/8 x 13) aluminum, is somewhat beat up and want to replace it with a new one. This is a confusing subject,since I have no tach and no unlimited supply of props to experiment with. Normally just myself but sometimes a fishing partner,a *****ing motor battery and 6 gallons of gas is onboard.What would be the correct prop? Thanks for any help.
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Go to Yamaha's web site Home | Yamaha Outboards and look for a performance bulletin with a similar boat/motor as yours. -
I feel for ya/Originally posted by moonwalker View Post
I just went through this process, and found the lack of helpful information frustrating.
The Yamaha web site tool wasn't much help for me. None of their boat examples matched my boat. I finally just guessed and bought a "cheap" aluminum prop so I would have something real world to work with.
I have a 16 ft flat bottom jon, all decked it like a bass boat. I put a Yamaha 40hp, 2sroke on it.
The guy I bought the prop from suggested a 12 or 13 pitch. He didn't have the 13, so I went up to 14. Well, I finally get out with a gps yesterday and clocked 30mph on the nose, at wide open throttle.
I don't have a tach but I wold guess that it doesn't reach the 5000 rpm mark. I would guess around 4500, so I think I did good.
One thing to consider when comparing yours to other people's rigs.
Different makes of motors have different lower unit gearing.
So, If one guy has an Evinrude that turns the prop slower than you Yamaha, you would use less pitch than him for the same rig.Comment
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