[THEFERMANATOR]

Originally Posted by roffey

I have a question here. A 19 inch prop is faster than a 17 inch prop, correct? The reason why the 17 would be faster is the RPM would be higher and higher RPM would be more RPM on the prop? I only ask as my neighbor on the lake as a 4 blade 19 inch, my prop is a 23 inch. He wants me to get a 19 inch so my boat will be faster but I say the 23 inch at 4900 RPM with my 4.3 I/O is the correct setup. A 19 inch would be to high a RPM.

Please correct me if I'm wrong, hate that when I'm wrong, LOL.

The correct prop to keep the engine in its powerband that works with your hull and needs will be the fastest. Theres alot more to propping than just pitch and rpm's. You need to prop your boat to run at the correct wot rpm's, but you also need to pick the correct number of blades, rake, cup, blade design, and such for your boat to run at the correct attitude under power. A higher pitch can slow you down if your engine can reach enough rpms to reach peak power. The searay I did had a 5.7l tbi engine, and it picked up 9 mph and 600 rpms at wot by having the prop repitched from a 17 to a 16. Its not just about pitch, its about setting the boat up.

As to yours, 4900 may mean you could use another inch of pitch, or might be dead on. Without knowing the exact engine, I can't say where it makes peak power at. And without lnowing how the boat rides out and planes, theres no way of knowing if you have the correct style prop.