Prop advice

[Frankie50]

I recently bought a185 tournament with a 150 Yamaha. I’m in Florida using inshore. The prop is dinged up so I want to replace it. I think I can see a marking on the current prop of 18m ( maybe). Full throttle I’m at about 5100 rpm. I guess not knowing the pitch I’m have now makes it hard to know where to go. Any advice is welcome. Thanks.

 

[seasick]

The diameter and pitch on the original prop is often stamped on the flange inside the end of the prop that faced forward. Remove the prop and clean the inner hub to look for the markings.

 

[Peter A]

Surprised that with 150hp on a pretty light boat you only turn 5100 rpm, presuming that the motor is making full power and the hull is clean.

Year and model of the engine? I’d think on that a Reliance 14.25x18 would be the approximate prop. But that’s a guess among lots of options.

Call or email Ken @ PropGods, if you provide your boat/motor/current prop/performance data you can get a good recommendation and if you buy from them a good price and return policy. They do not sell Yamaha Reliance but have other options including a powertech that is very similar to the Reliance or other prop designs and brands that will match your intended use.

I bought my current prop from Ken, a Powertech SCE4 semi-cleaver design 14x14 to get 5700rpm smooth water from a F200 on a much heavier 208.

I have a spare, lightly used Solas Rubex HR4 14.5x15 that I can sell you at a good price if that turns out to be a possible match for your boat.

 

[DennisG01]

Is the hull bottom perfectly clean? Were you trimming up as high as you can go without ventilating?

Yamaha makes very good props - both in metallurgy and engineering. If it turns out that 18M is correct, just get it repaired. Down in Florida there's probably a prop shop on every corner.

It's an 18" pitch... "18"M. The diameter... you could physically measure if you want if you don't find a stamping (which you should).