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Thread: 26-27 coho with 150's

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    New member fishnhuntr's Avatar
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    Default 26-27 coho with 150's

    Anyone out there running one with twin 150's? If so, any regrets on power? I'm considering a 26' and am concerned it'll be underpowered. Appreciate any info guys.
    Cody

  2. #2

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    Quote Originally Posted by fishnhuntr View Post
    Anyone out there running one with twin 150's? If so, any regrets on power? I'm considering a 26' and am concerned it'll be underpowered. Appreciate any info guys.
    Cody
    I also was concerned about the 27 being under powered so I bumped mine up to a 28 with twin 200's. I also got a 10' beam for the room. But I dont know for sure if the 150s are to small.

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    Member spoiled one's Avatar
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    If forum member ebbtide does not chime in, shoot him a PM. He has the 27 with F150's. He seems to be satisfied with the performance.
    Spending my kids' inheritance with them, one adventure at a time.

  4. #4

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    It all depends on what you think underpowered is.

    If you don't mind your engines working in the 4300-4500 rpm range at cruising then the 150's will be fine for you.

    From what I've heard the 150's will get a 27 on plane very quickly, so that tells me they aren't underpowered. All of the 27's with 150's that I know of use 17 pitch props, if you have a heavier load you can drop to 16's and still have good performance, but will sacrifice top speed.

    Now, if you are into the most efficient cruising speed where the engines aren't working as hard, you may want to consider more power.

  5. #5

    Default 150's

    You will not be under powered. If have a 30' hewes craft w/ twin yamaha 150's w/ 17 pitch props and it works fine. Top speed is about 44 mph at 5400 rpm. When it was a 24' I used 19 pitch prop and the top end was 51 mph at 5900 rpm. Not to much of a difference considering the boat is 25% longer.

  6. #6

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    From the 2006 EPA dyno tests on outboards it shows the Yamaha 150 actually producing a little over 160 hp, whereas a 225 Yamaha is only at 205 hp and I've heard the 200 is around 190hp.

    So, you are actually getting a boat with 320 hp and the performance numbers tend to agree with that.

  7. #7
    New member fishnhuntr's Avatar
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    Default Thanks fellas

    I appreciate the responses. I am actually considering it now whereas before I was pretty well dead set against the 150's. I did send Ebbtide a pm but he probably hasn't seen it yet. I am a little concerned about the fuel usage, he said he was burning 18-20 gph @30mph, whereas a buddy with a 26' Raider twin 150 honda's is burning 12-14. However Ebbtide is running a bigger, heavier boat and with 8 people and gear a lot of the time it sounds like.

    rmkak- Efficiency at cruising speed is my primary concern, along with power to battle through PWS weather and possibly having a motor go down, top end speed really matters very little to me, unless WOT was 20 mph or something! lol The 43-4500 rpm range is also fine with me, seems to be pretty typical for that kind of speed, my optimax runs right in there at about 30mph. Thanks for showing me those numbers too, actually makes me feel better about if they're pushing out 160hp or so compared to the 200 at 190.

    Spoiled, 4whlr, smokum thank you for the replies!

    Guess I'll get back to my fence sittin....

    Cody

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    Member Ebbtide's Avatar
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    Default GC with twin 150's

    Fishnhntr I sent you a pm. But these are approx numbers you can expect from a 27 foot GC loaded light with twin 150 4-stroke yamaha's. A 26 footer will have even better numbers. These numbers were taken with stock props. In short 150's have plenty of power plane a 27 footer easily. The chart below stops at 5000 rpms because thats where the captain/boat/seas determined the trial would be over. There was still more throttle and the RPM limit on these motors is 6000.



    RPM GPH Speed
    1000 1.8 2.5
    2000 4.0 6.1
    2500 8.5 7.5
    3000 10 10.6
    3100 11 16.1
    3400 13.2 19.5
    3500 12.7 20.4
    3700 15.0 23.0
    3800 14.8 25.2
    4000 16.0 26.6
    4500 21.4 31.7
    5000 28.5 37.0
    "Ebbtide" 27 X 9 GlacierCraft
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    338157869

  9. #9

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    Ebbtide - What's your max operating RPM at WOT and what pitch props are you running?

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    New member fishnhuntr's Avatar
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    Ebbtide,
    Thanks for the pm's and also the numbers you put up. Have you done something similar since you put the 17 pitch props and hydrofoils on?

    rmkak-that's what he said on another thread, if he's got the same setup still.

    Cody

  11. #11

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    I was wondering what max RPM he has been able to achieve with that setup. If it's 6000 rpm, then it's near the engine redline, whereas if it's 5200 rpm, then lower pitch props could be necessary. I don't think those numbers have been posted though.

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    Member DMan's Avatar
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    Spoiled One knows a guy with a 26 GC and if I recall correctly he is running at about 32MPH burning 14 - 16 GPH depending on conditions.

    I am supprised at Ebbtides numbers as he is burning about the same as Spoiled One in a longer much heavier boat.

    RMKAK, do you know what the actual HP output of the 250 was?
    ... aboard the 'Memory Maker' Making Memories one Wave at a Time!

  13. #13

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    From the EPA test engines- Yamaha

    Rated and Tested
    115 hp 107 hp
    150 hp 160 hp
    200 hp 190 hp
    250 hp Not tested
    300 hp 294 hp
    350 hp 328 hp

    I have heard that the 250 produces more than the rated power.

  14. #14

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    Here is the download link to the Spreadsheet.

    http://www.epa.gov/otaq/cert/eng-cer...ar-si07-09.zip

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    Member DMan's Avatar
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    Default

    Quote Originally Posted by rmkak View Post
    From the EPA test engines- Yamaha

    Rated and Tested
    115 hp 107 hp
    150 hp 160 hp
    200 hp 190 hp
    250 hp Not tested
    300 hp 294 hp
    350 hp 328 hp

    I have heard that the 250 produces more than the rated power.
    I heard the same I was just trying to confirm. With 89 Octane it is supposed to produce around 260 but if you choose to run 87 it is less. Thinking probably around 230 but that is just a guess.
    ... aboard the 'Memory Maker' Making Memories one Wave at a Time!

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    Member DMan's Avatar
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    Quote Originally Posted by fishnhuntr View Post
    Anyone out there running one with twin 150's? If so, any regrets on power? I'm considering a 26' and am concerned it'll be underpowered. Appreciate any info guys.
    Cody
    Sorry for thread highjacking,

    To address your question I have talked to a few people running 27' GCs that are pleased with the performance. Top speed will be around 40MPH. Based on other 26' boats on the market and performance with twin 150s I think you will do great.
    ... aboard the 'Memory Maker' Making Memories one Wave at a Time!

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    Member Ebbtide's Avatar
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    I don't have that setup anymore. The aluminum props that came stock were good but I could only reach about 5200-5400 rpm's. I have since gone down to stainless 3-blade 17 inch props and have put on hydrofoils and skeg gards. I have ran another set of numbers with that setup but I don't have them with me here. I will try to post them soon. They are a little better but not as much as you would expect. I looked back to see what kind of numbers Spoiled One was getting but could not find the post. Could you post again those numbers for comparison Spoiled One.
    "Ebbtide" 27 X 9 GlacierCraft
    MMSI#
    338157869

  18. #18
    Member spoiled one's Avatar
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    Quote Originally Posted by Ebbtide View Post
    I don't have that setup anymore. The aluminum props that came stock were good but I could only reach about 5200-5400 rpm's. I have since gone down to stainless 3-blade 17 inch props and have put on hydrofoils and skeg gards. I have ran another set of numbers with that setup but I don't have them with me here. I will try to post them soon. They are a little better but not as much as you would expect. I looked back to see what kind of numbers Spoiled One was getting but could not find the post. Could you post again those numbers for comparison Spoiled One.
    Here you go:

    rpm mph g/hr mpg
    4300 25 18.3 1.37
    4400 32.3 19.2 1.68
    4700 33.9 20.5 1.65
    4800 35.6 22 1.61
    5200 38.2 26 1.45
    5500 40.5 32.4 1.25
    6000 44 36.8 1.2
    6100WOT 46.4 40 1.16

    Test was conducted with flat seas and no wind. Approximately 270 gallons fuel and 4 adults on board. Props were stock 13.25x19 yamaha black stainless. I am currently turning 14.25x 17 solas 4 blades. WOT is 47mph @ 6000 rpm. I do not have all the numbers handy, but they are similar to the previous ones. With the 4 blades I get better handling at the dock and it just "feels" better. What did you gain with the hydrofoils?
    Spending my kids' inheritance with them, one adventure at a time.

  19. #19

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    Ebbtide- Were your stock aluminum props also 17 pitch?

  20. #20
    New member fishnhuntr's Avatar
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    Quote Originally Posted by DMan View Post
    Spoiled One knows a guy with a 26 GC and if I recall correctly he is running at about 32MPH burning 14 - 16 GPH depending on conditions.

    I am supprised at Ebbtides numbers as he is burning about the same as Spoiled One in a longer much heavier boat.

    RMKAK, do you know what the actual HP output of the 250 was?
    Dman if that's the case I'd be sold, those are the kind of numbers I was hoping to see, or hear about rather. Think I'm getting more gray hair just contemplating buying this boat...lol.

    Cody

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