Looking to upgrade

Discussion in 'Downeast Boat NEWBIES' started by No Cod, Mar 25, 2018.

  1. Diesel Jerry

    Diesel Jerry Captain

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    I forgot about him. Damn nice boat. Good guy too. Used to be on here a lot.
     
  2. southshore30

    southshore30 Senior Member

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    My Southshore 30 can cruise 23-24 and it tops out at 27 with a 370hp Yanmar. It’s a 2 mile per gallon cruise which is extremely good for a boat
     
  3. WoundUpMarine

    WoundUpMarine Captain

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    Yup, I was just talking to him yesterday, he'll be at Boothbay for the races.

     
  4. xbskt

    xbskt Captain

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    Jerry, you are not suggesting that some folks might modify their 410 Sisu diesels to gain a competitive advantage are you? Would that not be against the rules?:)
     
  5. TedFJ40

    TedFJ40 Senior Member

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    Just saw this. I have a CAT c7 Acert 454 on my MC 35. I go as follows from some notes in my log...all numbers taken from random days, tides etc:

    2000 rpm/13.0 kts/9.0 gph
    2100 rpm/13.4 kts /9.7 gph
    2143 rpm/13.5 kts/9.9 gph
    2150 rpm/14.1 kts /10.3 gph
    2250 rpm/16 kts/ 11.1 gph
    2300 rpm/14.6 kts/12.2 gph
    2311 rpm/14.5 kts /12.9 gph
    2350 rpm/15 kts/13.3 gph
    2370 rpm/16.3 kts/13.2 gph
    2400 rpm/17.6 kts/ 12.9 gph
    2499 rpm/17.7 kts/14.7 gph
    2700 rpm/19.1 kts/18.7 gph
    2878 rpm (WOT)/21.2 kts/23.1 gph

    I generally like to cruise around 2300-2400 rpm. Also, I made the mistake of filling all water tanks when I got the boat last year and kept full (I carry 200 gal.) Don't know what I was thinking - next year I will fill 1/3 to save the weight. I also carry 340 gal fuel. Boat was built as cruiser and is heavy but she runs great even with the weight. I'm cutting back some of the "day beds" they had in the cockpit to make the boat more fishy-that will save some weight too. Looking forward to see if my #s change.
     
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  6. Old Mud

    Old Mud Captain

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    Good thinking Ted, think of this. Carry only 40 to 50 gals. of water and save 1000 # right there alone.
     
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  7. yanmar

    yanmar Captain

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    I threw the ole lady off once to see if my boat was any faster but it wasn't but it was quitter ........
     
  8. tunaorlater

    tunaorlater Captain

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    All my tankage is in the cockpit. I gain over a knot when I put in 400 gallons fuel and 100 water.
     
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  9. TedFJ40

    TedFJ40 Senior Member

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    Makes sense. I was walking down to the dock one morning and noticed my boat bow heavy by an inch - I panicked - thought I was taking on water. Then the lightbulb went off. Day before I ran dry the cockpit 150 gal tank and was also light on fuel. Bow water tank still had 50 gal. Next season I will put only 10 gal in bow for reserve and keep cockpit tank at 40-50 gal as Mud suggested.
     
  10. Muscie

    Muscie Senior Member

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    36 Flowers finished by Cape Island, 2014 ; 645 QSM11
    For comparison:
    My 36 flowers w/645 qsm11 cruises at 19knots w/app. 18gal /hr.fuel use at 1850 rpm.
    at 1950 rpm I am at 20knots at about 19gal/ per hour.
    This is with a fully loaded boat 4 people & app. 3/4 fuel (300 gal) 50 gal water, etc
    After that consumption goes up dramatically. But I rarely find the need to exceed 18 knots. Very comfortable in most conditions (which is app. 1750 rpm with) & a little better fuel economy.
    (boats are not economy cars :))
     
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  11. Diesel Jerry

    Diesel Jerry Captain

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    If I was building a boat I would seriously consider putting the genset against the transom. Not ideal for you sportfishing guys but ideal for a family cruiser. I think it would give good balance to most DE's pending other equipment and tanks.
     
  12. Old Mud

    Old Mud Captain

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    Yeah, that and tabs.
     
  13. Diesel Jerry

    Diesel Jerry Captain

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    Those too. But it would be nice to get all that noise aft. Also it would make the genset more serviceable.
     
  14. ArchHibb

    ArchHibb Captain

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    ^ That's a great idea. The question is; Does the gennie need to be on centerline for weight balance and greatest hull depth below decks? If so, that leads to; Is there enough room between the transom and rudder post on a 33-35' for it?

    Back to the OP's original question; of the 20+kt. / 33' examples mentioned so far, (33YB w/QSB 480 and 33SW w/FPT 420), can you buy one new or used for $200k? o_O
     
  15. Diesel Jerry

    Diesel Jerry Captain

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    If building the boat I would build a box the size of the genset out of some plywood to get an idea. My first thought would it would be mounted on deck with an enclosure disguised as seating around it that could be easily removed to gain access. Therefore not interfering with the top of the rudder post. The genset we just installed on a boat weighed 377, that is less than two of me, or around the weight of 10 or 12 lobster traps.
     
  16. powderpro

    powderpro Captain

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    There are two 2008 31' Duffys for sale at $200k. They should be able get a 20 knot cruise. You wouldn't be able to get a new 31'-33' that cruises 20 knots for $200k.
     
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  17. ArchHibb

    ArchHibb Captain

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    A 31' is a great choice to meet the stated budget, but that's a noticeable step down in size from 33-35'. Might not matter depending on the mission.
     
  18. F/V First Team

    F/V First Team Captain

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    Northern Bay 36 - Modified


    Here is a ride on a MC35 with 500 hp
     
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  19. No Cod

    No Cod Member

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    30 sisu
    Thanks for all the info. guy`s, I`am looking around for a good used one first.
    seems like all the builder`s are booked.
     

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