"Threw some numbers in a prop
"Threw some numbers in a prop calculator for ya, and while I don't know exactly how you load your boat etc, assume 2 persons on board plus junk for the day in addition to normal rigging/safety gear.
Gave me two recommended 3 blade props - either a 14 to 14 1/2 Diameter, 17 Pitch or a 15 Diameter 15 pitch. Don't try a 15D/17P, that will cause your engine to bog out.
Pitch is often discussed, ignoring the diameter. Diameter has much more of a drastic effect, inch for inch compared to the pitch.
If you wanted to run a 4 blade, you would reduce your pitch by 1 or 2 depending on what is available. A 4 blade will give you a better hole shot and get you on plane faster and keep you on plane at a lower speed, but will shave a couple mph off the top end.
As a final note, while a prop calculator can give you a decent recommendation, it's always best to determine the prop based on your tachometer. There is really no way that a piece of software can account for all the possible variables even between two identical boats. You may run more fuel, extra battery, heavier passengers than "Bob" who has the exact same set-up, therefore both of you may run different props.
For your particular motor you want it to be turning about 5400 rpms (optimum) at wide open throttle. With the same diameter, upping your pitch by 1 will cause the rpms to drop by approx 200 and vice versa. If your current prop is allowing you max out near 5400 (+/- 100), you are set up correctly.."
