SDFever

I had the luxury of doing some real run testing with my boat and thought I’d share the numbers. Lots of people (myself included) try to figure out what ratios work best with given props etc… This info is not all inclusive but this is what I had to work with. The drives are stock with stock x-dimension.

The boat is an 03 27’ Fountain single step with Raylar HO600 about half tank of fuel at any time. Kept adding small amounts while running. Recently had the bottom blue printed. Numbers from digital tach (SmartCraft SC500) I had about a 12 - 15 knot tail wind with very consistent 1 – 2 foot white caps. Running downwind of course and skipping across the chop.

1.65 Drive stock 32 RH Bravo I Four Blade:

3500 rpm cruz at 41 mph
5350 – 5400 at 82 mph

1.50 Drive stock 32 RH Bravo I Four Blade:

3500 rpm cruz at 47 mph
4820 rpm at 80mph

1.50 Drive stock 30 RH Bravo I Four Blade:

3500 rpm cruz at 49 mph
5000 – 5050 at 80 mph

The hands down winning configuration on this boat is a 1.65 gear set turning a labed 34. We’ve achieved 86+ with that setup at around 5200 – 5300 rpm.

If you were to cut the stock 32 down and run it on the 1.50 gear set it would get better but not nearly equal to the 34 setup.