Pontoon Boat & Deck Boat Forum

Which spins faster/higher rpm's at WOT assuming the identical diameter and pitch?

Currently have an aluminum 15.25x 15P aluminum at WOT 5700rpm?

Was wondering what the same prop in stainless would do?? Is it worth the extra $500

The best prop for your boat would probably be the Yamaha Reliance 15 pitch. That's what my Bennington/Yammie 150 is running. They originally put a 14 pitch prop on the boat, but I was up against the rev limiter and the boat was 3-4 mph less.

Any toon with a 150 hp needs the stainless prop. I've just found them to be more durable on my inboard outboard boat--after crunching an aluminum prop yearly. They just last so much longer.

Or a 15 x 15p Enertia.

What difference performancewise does the SS make versus the aluminum?

Have you tried the same prop but in an aluminum model?? Anyone got real numbers??

In a timed event it's minimal at best. Hardly worth the extra bucks unless you have it to throw at a prop. If you run wide open for long distances or for most of the time it'd make some difference. Probly not noticeable without a GPS. I'm not wide open for very long nor do I have 500 bucks for a $130 prop that basically does the same job. I've been on the same prop for four years now and I'm pretty protective of it. It's got a couple nicks in it but I don't feel anything or see a diff in RPM, so I'm good.
This is the case of an identical prop, but diff metal. Most Stainless props tend to perform (let's say better) because they have different pitch and rake angles built into them that are performance oriented. So, yeah, if you go from aluminum to stainless you'll often see a different outcome to an extent. Sometimes, a change in pitch or a 1/4" in diam is necessary to maintain max RPM. They difference will most likely be in the slip % numbers.
Granted my 150 will handle the stainless but rarely would I use it to it's full potential. It's like buying a Barret 50 cal to go deer huntin. You can do it, but it just don't make sense to me.