How long to reach top speed

[Destroyer]

Also, along with everything that TheFermanator just said, don't forget that different materials will also effect engine RPM's. You mentioned both Aluminum and Stainless Steel props.. Under load, while being spun against the resistance of the water, they both will flex, but at different rates. The aluminum more so than the SS. The amount of that flex also effects the final RPM's vs SOW of the boat.

[THEFERMANATOR]

And don't forget number of blades and prop slip. We went from 21 pitch vengence props on the neighbors boat to 18 pitch 4 blade michigan wheels(both stainless). The boat runs nearly the same top speeds, turns slightly less cruise rpm's at higher speeds, jumps on plane instead of just looking at the sky wishing it could get on plane(had have everybody move forward, trim both drives in, and run the tabs down all the way to plane out before), and runs 100 rpm's lower at wot. The searay 250 I did a few years back had similiar results. Went from a 17 pitch vengence to a 16 pitch mirage style, got it off the limiter, planed better, and ran alot faster.