Posts: 3480
Location: Elk River, Minnesota | Hiya,
I would assume a 4 stroke as I don't believe yamaha made a 60 2 stroke that I am aware of.
The relative change is roughly 200 RPMs per inch of pitch and it is a relative amount as boat design, weight, etc all come into play when setting up your rig for your optimum performance. The change is fairly constant among all HP ranges due to smaller diameter props for smaller motors.
I believe that particular motor has a max of 6000 RPMs, so what would be good to know is what prop you have on it now, what are the max RPMs you are getting with that prop and under what load (gear, persons, gas, etc) you have on the boat as well.
There is a bunch you can do to deal with changes including a motor height change, prop design change, etc, but in your case with a 60hp motor, a steel prop may or may not help. The solas props are great props for the lower mid-range powerplants as the props are squeeze cast aluminum, which allows them to have more performance characteristics of steel with the cost of aluminum. The Alcup series (which I believe is the amita series now if memory serves me correctly) is cupped on the trailing edge giving it a better bite on the water than your standard white yamaha prop, which has very little (if any) trailing cup.
If you can get a baseline set of numbers, (speed, rpms and your prop size) we can go from there and see what possibilities can be had.
Steve |
