Another Prop/Rpm/Speed thread

[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.