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Thread: GPH

  1. #1
    Member ACBMAN's Avatar
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    Default GPH

    I would like to know what boat you have (length,beam,weight and motors) and what your GPH are at 30 MPH,thanks.

  2. #2
    Member spoiled one's Avatar
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    Quote Originally Posted by ACBMAN View Post
    I would like to know what boat you have (length,beam,weight and motors) and what your GPH are at 30 MPH,thanks.
    30'x10' with twin F250's fully loaded carrying 50 gallons of water, approximately 400 gallons of fuel, 4 guys, supplies for a week I burn about 22 gallons an hour at 30 mph. Weekend trips I burn around 20 gallons an hour. I believe my motors are setting way to low. On step my cavitation plates are totally burried and I throw some interesting rooster tails. I am going to raise them up and see if I can improve the economy a bit.
    Spending my kids' inheritance with them, one adventure at a time.

  3. #3
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    Quote Originally Posted by spoiled one View Post
    30'x10' with twin F250's fully loaded carrying 50 gallons of water, approximately 400 gallons of fuel, 4 guys, supplies for a week I burn about 22 gallons an hour at 30 mph. Weekend trips I burn around 20 gallons an hour. I believe my motors are setting way to low. On step my cavitation plates are totally burried and I throw some interesting rooster tails. I am going to raise them up and see if I can improve the economy a bit.
    Pete,
    Thought your little ship is a 29 * 10?

    MB

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    Member spoiled one's Avatar
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    Quote Originally Posted by msbeeson View Post
    Pete,
    Thought your little ship is a 29 * 10?

    MB
    Yea, that is what it is supposed to be. Jason and I measured it before the windows were installed and she came out just a bit over 30'. They all seem to be a bit longer than the stated size.
    Spending my kids' inheritance with them, one adventure at a time.

  5. #5

    Default

    I might have something to post after this weekend. We are going to splash What-a-Day on Friday, hopefully, in Whittier for the weekend and again on Monday in Seward.
    What-a-Day
    27' x 9.5' Glacier Craft - Volvo 300hp D4 Diesel
    Remember: Any fool can be uncomfortable.
    Denny

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    Default F350 facts

    Fully loaded 400g of fuel, 50g of water. 15g of kerosene, 4 guys, 2 coolers of ice. At 3700 rpm I burn exactly 24gph, 32mph. At 5500rpm I cruise at 54mph, burning 56gph. That is .8mpg. It takes less than 6 seconds to get this awesome ***** up to step. When I burn one tank empty(Montegue and back) I can get 57mph with over 240g of fuel on board. I don't suggest that you run at this speed all the time unless you own oil stocks. No one can run like this with a compareable boat. If I could get 6000rpm I would do over 60mph, but I feel that the engines are way too efficient set up the way they are. I have no regrets buying these engines. If you don't look at your gauges you don't know the engines are on. I don't believe how incredibly built my boat is, I don't believe that I own it. Thank you to the Bounty Hunter(and my wife for her Patience) for showing me these totaly bad ass boats. I looked for years and have owned alot of boats and there is nothing out there, NOTHING, that compares to a Glacier Craft Boat.

  7. #7

    Default

    What-a-Day 27'x 9.5' Glacier Craft, 300hp Volvo D4 Diesel with Duo Prop Outdrive with a G3 Prop
    Capacity 200gal fuel, Range 500+ miles, 25 gal water, 20 gal Kicker gas, 11 Gal Kerosene. The boat weighs approximately 7500lbs dry and 9500 wet, and 10800 with full cruising gear and 4 people.


    Test - 9/21/2008, 1/2 to 1ft seas, slight wind.
    The test was conducted with 40gal fuel, 25gal water, 10 gallons of gas.

    RPM MPH MPG GPH
    700 Idle 4.6 11.0 .4
    1000 6.3 6.7 .9
    1200 7.2 5.0 1.5
    1400 8.4 4.0 2.1
    1600 9.2 3.2 2.0
    1800 9.9 2.4 4.1
    2000 10.8 2.1 5.1
    2200 12.9 2.0 6.3
    2400 16.1 2.1 7.8
    2600 20.0 2.4 8.4
    2800 24.0 2.7 9.0
    2900 26.6 2.8 9.6
    3000 28.0 2.8 10.0
    3200 30.5 2.7 11.0
    3640 WOT 36.25 2.3 15.0

    The results are very similar in speed and fuel use to a previous test with 120 gal of fuel and 3 people but a G4 prop. Couldn't reach the recommended WOT with the G4 prop. The G3 runs over recommended WOT with a light load, but, will be right on with a heavy load.

    It looks like I can go from 24 to 30mph and the fuel economy in mpg is roughly the same. The sweet spot might be a bit narrower with significantly more weight in the boat.
    What-a-Day
    27' x 9.5' Glacier Craft - Volvo 300hp D4 Diesel
    Remember: Any fool can be uncomfortable.
    Denny

  8. #8
    Member Ebbtide's Avatar
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    Default

    I am burning about 18-20 gal/hr at 30 mph with a full load (8 people and their gear). That is a 27 X 9 GC with twin yamaha 150's. I run ss props, hydrofoils and ss skeg protectors. Average mpg is 1.5 to 1.6.
    "Ebbtide" 27 X 9 GlacierCraft
    MMSI#
    338157869

  9. #9
    Member spoiled one's Avatar
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    Quote Originally Posted by Ebbtide View Post
    I am burning about 18-20 gal/hr at 30 mph with a full load (8 people and their gear). That is a 27 X 9 GC with twin yamaha 150's. I run ss props, hydrofoils and ss skeg protectors. Average mpg is 1.5 to 1.6.
    What did you gain by adding the hydrofoils? I have thought about adding a set of permatrims to see if that would help with some stern lift.
    Spending my kids' inheritance with them, one adventure at a time.

  10. #10
    Member Ebbtide's Avatar
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    I gained some stern lift. I am able to stay on step at slower speeds and I notiticed decreased porpoising at higher speed. I might have gained a little economy but not real sure of that.
    "Ebbtide" 27 X 9 GlacierCraft
    MMSI#
    338157869

  11. #11

    Default Wow dtol...

    11 gph @ 30 mph is sweeeeeeet.
    More importantly for trolling speed here for Hawaii is the 2 gph @ 8 or so mph. My buddy has a 10,000 lb glass boat that he wants to re-power and is thinking of a D-4 or D-6. Most of our fishing is done at the above trolling speed; it's very rare here to be able to go over 25 mph due to our typical sea conditons. We contemplated deep sixing the old Cummins/Stern Power drive in favor of twin 4-stroke OB's but they are just not nearly efficient as a diesel especially after doing some numbers research.
    We figured his other boat (a 19' fiberglass hardtop with twin 60 HT Yamaha's) burns just over 2 gph trolling (22 gallons for a 10 hr. day); has 4 blade SS props.
    Jim

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    Default Major Horse power

    There is a GC boat here in Sewered that is powered with triple 450 hp Yamaha's. What kinda fuel economy would this boat get and how fast would it go?

  13. #13
    Member jrogers's Avatar
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    Quote Originally Posted by kodiak kid View Post
    There is a GC boat here in Sewered that is powered with triple 450 hp Yamaha's. What kinda fuel economy would this boat get and how fast would it go?
    I have seen that boat, and you are right, it says 450 on the motors. Unless I am really missing something, there is no such thing as a Yamaha (or anyoine else, for that matter) 450hp outboard. My guess is that they are 250's.
    2009 Seawolf 31'
    www.seawolfmarine.com
    Fully Loaded

  14. #14

    Default

    It has 3 150's for a total of 450 hp.

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    Member spoiled one's Avatar
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    Quote Originally Posted by kodiak kid View Post
    There is a GC boat here in Sewered that is powered with triple 450 hp Yamaha's. What kinda fuel economy would this boat get and how fast would it go?
    That boat has trip F250's. The original owner re-labled them when he had the boat painted. I believe it is a 50+ mph boat.
    Spending my kids' inheritance with them, one adventure at a time.

  16. #16
    Member jrogers's Avatar
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    Is that the boat that use the have the AK Demolition logo on the side? I think I saw it out this summer, and it is now named Thirsty. Probabily a clue about the GPH on this boat.
    2009 Seawolf 31'
    www.seawolfmarine.com
    Fully Loaded

  17. #17
    Member spoiled one's Avatar
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    Quote Originally Posted by jrogers View Post
    Is that the boat that use the have the AK Demolition logo on the side? I think I saw it out this summer, and it is now named Thirsty. Probabily a clue about the GPH on this boat.
    That would be the one. He sold it and is now running a big, diesel powered maxwell catamaran.
    Spending my kids' inheritance with them, one adventure at a time.

  18. #18
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    I didn't think any one made a 450. I would sure love to drive it if I wasn't responsible for the fuel bill.

  19. #19

    Default

    I have a 27' x 9 1/2 with 150's and burn 16 gph with 270 gallons of fuel, 40 gallons of water and 10 gallons of diesel plus gear.

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