It's a Powertech OFS 4 - I worked with Ken at Propgods.com and we tried a 16P four blade and that was not satisfactory, so he shipped me a 15P 4 blade and it was better than expected. It was the rare trifecta of better low end, mid range and top end speed improvement. I was willing to lose a smidge at the top end to get the other advantages, but it was a bit better there too.
And of course, being a four blade, you have a bit more response around the dock - and our lift is in a tough wind./current environment .. and with the transom design, the C24 is lousy in reverse....it still is but the fourth blade helps for sure.
Depending on conditions, some typical numbers - that I've recorded on my iPhone cam while operating...played with the engine trim a bit...did not use my tabs, which are so small they are virtually useless, for these tests.
37 at 4800 with 1.9 fuel
44 at 5700-5800 with 1.2 fuel...touched 45 very briefly and would drop to 43 some but 44 held pretty good.
39-40 at 5100-5200 with 1.9 fuel.....seriously seems like 5200 is the happy spot. Twin step boats are known to be more efficient at the higher cruise ranges.....and this would fit that.
I don't think 45 is the true top end in still water....I almost never have still waters or still winds....but it's a true 43 mph boat for sure.
250 Yamaha engine. And I cannot recommend Ken at Propgods highly enough. Dude started giving prop advice on some websites and it turned into a career and business for him.
And Cut should put this prop on their 24s......standard. It's simply a better boat with it.