Brine Shrimp Catamaran

Discussion in 'Multihulls' started by kelldog, Aug 8, 2017.

  1. kelldog
    Joined: Jun 2009
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    Location: Bakersfield, CA

    kelldog Junior Member

    Hello Everyone,
    I just purchased a Catamaran that was designed by Thomas Firth Jones. I would ask him the questions that I have but he is no longer with us. So the next source is this forum as I know there are many knowledgeable people here who may answer a few questions. The design is a 23.4 Brine Shrimp. The one I just acquired was built in 2000 by Shelby Craghead. I am not sure if he is around now.

    Question 1; I would like to lengthen the hulls by 3 feet to 27.4 feet. Where would be the place to insert the 3 feet? The section just before the aft beam? The section forward of the forward beam? Or, right in the middle of the hull/cabin.

    Question 2; Mast height per design is 27 feet long. (I have the plans that came with the boat.) Would I need a taller mast? (I think so)

    I have known of this boat since 2005 and Have seen it for sale over the years. It has lived a few lives. [​IMG] I have read Mr. Jones books and he is respected in the multihull community for his contributions to the affordable multihull self-build genre. I look forward to any feedback on my questions. I know this is not the "norm".

    Thank you,
    Kelly
     
  2. cavalier mk2
    Joined: Mar 2010
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    cavalier mk2 Senior Member

    I just replied on your cruising forum post. Right in the middle is my vote and I'd think about adding a mizzen instead of a rerig.
     
  3. kelldog
    Joined: Jun 2009
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    Location: Bakersfield, CA

    kelldog Junior Member

    Thank you Cavalier,
    I saw that you replied. I prefer a sloop rig. I don't plan on making any changes to the length for the next 6 months to a year since I want to get her in shape to go sailing. Have a few minor repairs to do first. It's been awhile since I had my own boat so I'll enjoy getting her in sailing shape.
     
  4. cavalier mk2
    Joined: Mar 2010
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    cavalier mk2 Senior Member

    I have drawings somewhere I'll try to look it up. You might get by with a taller mast and extended boom but if you want to keep the same rig proportions it means relocating a beam or adding another beam and a Wharram style mast case to span them and put the new rig where you want it. This also means new mast, rig sails etc... while a mizzen is relatively cheap. Your call, always best to sail it first and see what grows on you.
     
  5. kelldog
    Joined: Jun 2009
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    Location: Bakersfield, CA

    kelldog Junior Member

    Yes, I want to sail the boat as it was designed for awhile and learn the characteristics of the boat. My sailing grounds are Southern CA. I can't wait to be sailing over to Catalina.
     
  6. cavalier mk2
    Joined: Mar 2010
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    cavalier mk2 Senior Member

    If you don't have one a used light weight larger genoa will help for not much money.
     
  7. jamez
    Joined: Feb 2007
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    Location: Auckland, New Zealand

    jamez Senior Member

    I was thinking of building a Tiki 26 a decade or so ago and corresponded with TFJ about the BS (ha) as an alternative. Stll have the study prints. i like the approach to trailing but am unsure how practical it would have been. Can yours fold or was it built with solid beams? Do you have a reason for wanting to extend the hulls? IMO just sail it. Buy a bigger boat if you need more space.
     
  8. redreuben
    Joined: Jan 2009
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    Location: Beaconsfield Western Australia

    redreuben redreuben

    I am with jamez, why didn't you buy a 27' boat ? Don't want be doom and gloom but sounds like good money after bad. 27' hulls from a 24' will feel like 2 sewer pipes. I have a couple of his books, I like his attitude.
     
  9. kelldog
    Joined: Jun 2009
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    Location: Bakersfield, CA

    kelldog Junior Member

    Of course, buying a larger boat is the logical thing to do. I was looking for a 28-30 foot Trimaran but the two that popped up in my area disappeared. This one came up on the market so I went for it! I am not concerned with the hulls being too narrow after increasing the hull length. I'll be out on the cockpit the majority of the time. The extension would also extend the cabin. I am not in a rush to do any changes right away. First priority is to do some minor repairs and get it on the water to sail. Maybe after a good sailing season I will tackle the modification. My boat folds for trailering. I have the complete plans and an extra sheet was included to build it without the folding option with solid beams. TFG mentions that if the boat is not built to fold then it can be wider. I am looking to increase the length to add payload. If I do this down the road, I will also widen the deck with fixed beams. Maybe. However, being able to trailer the boat opens up a lot of sailing ground.
     

  10. cavalier mk2
    Joined: Mar 2010
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    cavalier mk2 Senior Member

    By the center I should say at the point of maximum hull beam and depth which looks to be either just forward or aft of the daggerboard. There are a couple ways to do it. If long term set up room is a problem you can build the center section as a module separately with each end having a ring frame to attach to ring frames at the ends of the bow and stern structures, Of course you want to bridge the joint at the keel and gunnels, where the main structural elements cross. The other way is to cut the hull and set up the whole thing in the correct location on the strongback all at once. In either case if the new center frame is slightly wider and deeper and the ends match the old center the section will flow into the bow and stern without a flat spot to the curves..

    It is more work than finding another boat but less than building from scratch.
     
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