I’m looking for some help on speed. I own a 1969 Hatteras 45 custom express. At some point the motors were swapped out for Detroit 8v92tta 735hp motors and capitol hy2500 marine gears. I was told they are 1.5.1 gears. The boat came with 29x ? Wheels on 2” shafts. I couldn’t get past 1900 rpm and 15 knots. Swapped out the props with a set of 3 blade nibral 26x28. Got 2400 rpm and only 17 knots. Any opinions?
