Demountable, 30+ to 40+foot Cat design?

Discussion in 'Multihulls' started by voodoo child, Feb 3, 2023.

  1. voodoo child
    Joined: Feb 2023
    Posts: 3
    Likes: 0, Points: 1
    Location: indian ocean

    voodoo child New Member

    Hi to all.
    I am enjoying reading this forum since quite some time and learned a lot.
    But to be able to chose the "perfect" design for me, I would have to find a bit more specific answers to the questions i am still struggeling with.
    The cat does not have to be demountable, but has to be able to be build in parts. The hulls and nacelle have to be build completly, painted and finished than individualy transported a short distance, for assembeling by the waterside where it would be launched by crane.
    So a tube cat would be perfect, but the biggest i could find is Bernd Kohler`s KD105 KD105page
    I like this design a lot but it would be "perfect" just slightly longer and a little more space in the hulls with maybe a little more payload.

    Any suggestion, idea and comment would be helpful and apreciated.
    Thanx regards Voodoo Chid
  2. fallguy
    Joined: Dec 2016
    Posts: 6,885
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    Location: usa

    fallguy Senior Member

    One of the downsides to building this way is the boat needs to be taken apart and put together many times diring the build for this to work.

    It would be a rare cat that can be built all separate pieces and then cobbled together.

    There are a few Wharrams I believe that get close.

    My cat is fully demountable, but I don't really feel it was a good decision to build this way; despite the goals. The boat would take at least a week and cranes on each end and special cradles to move. I have the hull cradles, but the work is so much, I'd only do it for a permanent move to say California; even then Panama seems more fun.

    It doesn't seem awful, but, for example, I fitted the cabin base to the hulls; then had to remove the base, and finish the cabin off the hulls and then crane it back up and pay the crane company and pay a friend and build 20' fork extensions for a tractor. The time and efforts involved in administering to piece building are really awful versus adding transverse bulkheads and being done when they are bonded. We are talking about weeks of extra work, crane time and money.. My hull cradles cost hundreds of dollars and over a week to build; for example. The hulls with the bdeck on sit on the ground even.
    bajansailor likes this.
  3. rberrey
    Joined: Oct 2010
    Posts: 495
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    Location: AL gulf coast

    rberrey Senior Member

    Voodoo Child , if you want a cruiser then there should be no reason you couldn't widen the beam on the KD105 pod and flare out the hulls for more space , add a little length to the hulls for greater payload .
  4. Alan Cattelliot
    Joined: Jul 2021
    Posts: 351
    Likes: 106, Points: 43
    Location: La Rochelle (Fr)

    Alan Cattelliot Senior Member

    TS3, first model by Marsaudon Composites. Demountable, sexy, and a lot of space. Initially designed for a raid on the Northwest Passage.

    TS3 Catamaran


    I'm currently working on a similar boat, lighter and with a little extra power, for her to be sailed in Finland. I've you're looking for a more "modern" touch.

    oldmulti likes this.

  5. guzzis3
    Joined: Nov 2009
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    Location: Brisbane

    guzzis3 Senior Member

    Richard Woods has a whole series of catamarans that do exactly this. He builds his designes and has faced exactly the problem you describe. He has a number of open deck models or his "cuddy cabin" designes that all can be built in parts and finished by the water.

    Sailing Catamarans - All Our Designs

    There are pages there showing him transporting a bridgedeck cabin boat on the diagonal to the water and the various designs that can be finished at the waters edge. Possibly start with the 29' saturn or the 34' Romany.
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