Am I at peak performance?

[Johny25]

Well finally had a chance to run my boat today and get some good solid numbers. I believe I am probably at the top end of what to expect from this setup but figured I would throw the numbers up anyway and see what the prop experts think.

Boat: 1984 Glastron SV-178 (17' fiberglass) reverse chine I believe
Engine: 1993 Johnson 120 V4 Looper.....very clean 120-122lbs compression all cylinders
Prop: 13X19 Stainless Steel (OMC prop I believe)

Test run #1-into a 8-10mph head wind 44 mph at 5350 RPM fully trimmed out
Test run #2-with 8-10mph tail wind 45.5-46 mph 5550 RPM trimmed out

With the 2:1 gear ratio my prop slip comes out to about 9% which I am very happy and surprised at

Boat weight 1200 lbs, motor 371 lbs, 2 adults combined weight 350lbs, 1 child at 45lbs, gear 150lbs roughly, 50lb batter and 10gallons of fuel approx 75lbs= Total 2,250lbs roughly

 

[steelespike]

Re: Am I at peak performance?

Sure seems ideal.Is the speed by gps?How is the hole shot?

 

[Johny25]

Re: Am I at peak performance?

Heya steelespike, was hoping I would see you on here Yes speed was from a good GPS unit and hole shot is also very good surprisingly. The 17 pitch aluminum I had on it before was a touch better on hole shot but even with the 19 pitch I am on plain in about 3 seconds. That looper seems to be a torque monster! Stands the boat up for a second and then sits her right down and pins you in the seat pretty good.

Oh and I had a speed verification by the local sheriff police boat this evening when I took it back out lol, they were trying to run me down in there jet boat that topped out at 45mph and they couldn't catch up to me. They said I was just a touch faster than them cause they weren't gaining on me....freaking guys chased me for almost a mile before I looked back and saw there lights on ha ha ha. All for a routine boat inspection geez

 

[SkiDad]

Re: Am I at peak performance?

I'd be happy with those numbers ! Nice boat by the way !