Is This Right ?????????????
 

I have a 22ft Advantage Citation with with a 500HP, the prop is a 24 4 blade and i can hit 5500 rpms but i think i am hitting the rev limniter. Here is my thinking on the prop that would put me in the ballpark. Keep in mind mercruiser says the optimum rpm for my engine is 5200rpm.

Current 24 4 blade non labbed = 5500rpm
26 4 blade non labbed=5100rpm
26 4 blade labbed=5400rpm
27 4 blade non labbed=4900rpm
27 4 blade labbed=5200rpm
28 4 blade non labbed=4700rpm
28 4 blade Labbed=5000rpm

Am i in the ballpark with my figures or am i way off, thanks for all your help. I want to stay with the 4 blade also.

Im a little confused but....theoredically speaking, the numbers you have written show basic differences in Labbed versus stock propellers.

Do you have a HP500 from Merc Racing?

Do you have any actual speed versus rpm readings?

Brett