Performance

[ScottM]

1982 23' Sceptre
1997 Yamaha 225 Saltwater Series (carb)
15x15 SS Yamaha prop
Cruise 25 knots @ 4500rpm
WOT 35 knots @ 5600rpm
Fuel consumption unknown, but est. 16gph @ cruise

[nestorpr]

1970 20' Seafari
1970 (rebuilt 1999) Mercruiser 140hp w/Alpha One outdrive
Stock prop, not sure of size
Cruise 23-25 mph @ 3000 rpm
WOT 32 mph @4500 rpm

[Skiblet]

1976 23 Superfish CC
2005 Evinrude DI 225 HP
15x17 SS prop ( forgot make )
Cruise 3800 RPM 27 kts
WOT 5650 RPM 44 kts

Once I finish the rebuild of her with twins I will post up. Probably in end of Feb.

[wadestep]

For reference: 2004 23' center console, 250 hp Suzuki 4-stroke.
4000 RPMs = 26 knots, 2.5-2.6 MPG
3800 RPMS = 24 Knots, 2.6 MPG
4200 RPMs = 27 knots, 2.4-2.5 MPG
This is calculated using a Floscan and GPS. MPG is also in knots. All are averages for load and weather conditions, which affect me about 5-10%.

[23yellow]

1984 23 CC Seacraft with 2005 Suzuki 250HP 4Stroke:

3700- 25.2 knots
4000- 27.5 knots
4200- 28.6 knots
4500- 30.7 knots (ideal cruising speed which is 12 GPH)
5000- 35 knots
5500- 37 knots
5950- 41 knots

[thedink9]

1985 23 CC, w/ 130 gal tank
2001 Yamaha 250HP OX66
Prop 15x19 Yami Saltwater Series Stainless
cruises 26 kts. @4000 & 13 gal/hr.
Top end 44 kts @5300 & don't ask

Dink

[Bigshrimpin]

Guys . . . Try to post as accurate information as possible. Not trying to be an ass here, but some folks are posting top end speeds that are impossible to reach given the combination of RPM's, gear ratio, and prop pitch that they are running.

Many people will look at these numbers and wonder what is wrong with their boat . . . and why they can't achieve speeds that person x is getting with the exact same setup.

40knts(48mph) vs. 40mph is a huge difference in speed.

Here's a nice prop slip calculator that should help . . .
boat speed is a mathematical equasion.

http://www.rbbi.com/folders/prop/propcalc.htm

[TUGBOAT]

Hulls My Man! A big diff. too. I would get right at 46 MPH before the re-store & now I'm lucky with a tail wind & swift current to get 39 ! Same everything (hull,motor,prop)except for weight ? New paint on the bottem. Juz' can't figure it out???? Now when I had the "Tweaked" 200 Mariner well lets juz' say WhooWeee! She be on da' top! Not even a shiner get disturbed!
Scream'n Hulls
Tug

[thedink9]

Big Shrimpin

You had me revisit my log and are correct as my top end was 42 MPH with half tank (65gal) @5300 rpm. Rich

[23yellow]

I get to 41 knots (not MPH) with the 250 Suzuki pushing a 16X21.5 prop.