Performance
 

Trader,
I would like to compliment you on this site; I have found it to be very informative, and to make a suggestion.

I would like to suggest that you post an updated performance chart for Seacrafts of different size and motor configuration. With all of the new motor technology out, and the ever-increasing cost fuel it seams to be a constant topic on this board. I think that many board members are investing in new engines and could contribute data from their experiences.

It would be valuable to have an unbiased review of different motor set-ups, brands, and attachments i.e. brackets, twins, inboard, etc. And most importantly how the new technologies perform Vs the old 2-stroke motors on a Seacraft hull.

I would be glad to supply an Excel spread sheet to help manage the data, or help in any way if needed.

Re: Performance
 

Tx egreen-

I will do this and put it under the reference section. Now I need people to post their boat engine combo's with #'s

if you want to start the post compile the data in excel I will be happy to put it online and give you the credit

Re: Performance
 

Sounds like a good idea to me. Members should also note if their motors are on a bracket and what props they are running and weather they are ss or aluminum.

Re: Performance
 

You want to start a new thread for this and make it a sticky?

Re: Performance
 

Roger-

yup

Re: Performance
 

I have twin 1998 SWS 150 Yamaha's on my 23 foot SF. My transom was rebult by the previous owner when he put the current outboards on eight years ago. It is the traditional transom setup (lots of wasted space). 900 pounds is a lot of weight to have in the back of my boat. I need to keep the drain plugs in the back of the deck when I am in the boat.

I probably have around 750 hours on the engines. They top on in the mid 40's at around 5,400 RPM's. When i cruise at 4,000 RPM's I am going around 32 to 33 MPH, and get a whaling 1.5 miles per gallon.

Re: Performance
 

I have a 78' 23 CC with a pair of mid 80's crossflow omc 150's with 21 pitch props it tops out at 50mph at 5200 rpm and cruises at mid 30's and gets a wopping 1.25 mpg. I am currently rebuilding a omc 225 to replace the 150's and also will be running a 25hp omc for a kicker. Hopefully this will increase my fuel economy without losing to much performance.

Re: Performance
 

1971 SeaCraft 20' CC
75 gallon tank (full)
T-top
Suzuki 140 4-stroke with 14x20 Stainless prop:

40mph at 6000rpm
fuel burn at 30mph - 5 miles to the gallon [img]/images/graemlins/grin.gif[/img]

Re: Performance
 

1976 SeaCraft 20' MA (Big Console)
70 gallon tank (3/4)
1 Person
1981 Mercury v225 w/wh-22 carbs
8hp Yamaha four stroke kicker
2 BIG - 6 volt golf cart gel batteries
Aluminum Prop (stock Yamaha 19pitch)
35mph at 4000rpm
Fuel Burn @ cruise (4000rpm - 35mph ) is 11 GPH = 3+ mpg
Top Speed is 49mph @ 5700/5800
-----------------------------------------------------
Wind and Weight really affect the numbers

Re: Performance
 

1986 20' CC w/2005 150 Yamaha 4-stroke no bracket
14.5 x 17 aluminum prop
40 mph on gps at 5100 rpms trimmed
Don't know gallons/hr - it's low
Motor is heavy but sweet

Re: Performance
 

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

Re: Performance
 

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

Re: Performance
 

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.

Re: Performance
 

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%.

Re: Performance
 

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

Re: Performance
 

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

Re: Performance
 

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

Re: Performance
 

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 :eek:well lets juz' say WhooWeee! She be on da' top! Not even a shiner get disturbed!
Scream'n Hulls
Tug :cool:

Re: Performance
 

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

Re: Performance
 

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