Aluminium sailing catamaran build

Discussion in 'Multihulls' started by Donnavan Wright, Sep 9, 2019.

  1. Donnavan Wright
    Joined: Sep 2019
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    Location: Tom Price Western Australia

    Donnavan Wright New Member

    5A1F12F4-544D-4E8E-AE59-4958D5B494C2.jpeg Good day all you salty legends ! I’ve been searching the internet and came across your page . Being a metal fabricator I have put in a lot of thought about building my own aluminium sailing catamaran , 40 to 45 foot would be ideal . I have access to a cnc plasma and aluminium mig welders . Space not a problem either . Time not a problem either as I’m working an ever 6/6 day roster with a 5 year plan . I’ll be starting from scratch building the gigs and developing templates and so on , my question is do I approach a boat designer or is there a site I can download the study plans , drawings and procedures from ?
    brendan gardam likes this.
  2. oldmulti
    Joined: May 2019
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    oldmulti Senior Member

    Hi Multihull Structure Thoughts thread on design net. The flowing pages have some aluminum boat details. Page 5 Banana Split 42 aluminium cat with thick skin. Page 14 Osram 7 48 foot cat, another tri. Page 20 Kat'alu 42 aluminum cat. Also Bruce Roberts does some aluminum cat plans in the size range.
  3. bajansailor
    Joined: Oct 2007
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    bajansailor Marine Surveyor

    Here is a link to the thread mentioned by Old Multi.

    Multihull Structure Thoughts

    Kat'alu is post #298. Old Multi had posted their catalogue which I will also add here, as she is a pretty neat design.
    It does help to illustrate though that there is a LOT of work involved in building a cat of this size.

    I think that Richard Woods recommends staying under 40' (or maybe even 35') unless you are building a commercial boat, as the time frame for an amateur builder will literally stretch into years.

    Attached Files:

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  4. Alik
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    Alik Senior Member

  5. fallguy
    Joined: Dec 2016
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    fallguy Senior Member

    It is taking me 3 years nearly full time work to build a 32' powercat. The design is complex and my hip failed. Finishing a 40 footer in two years full time work plus overtime is possible, but harder for amateurs, and harder for me as my legs don't operate much past 6:30pm. Richard has a beautiful 36' plywood powercat, but that is like a 4 year build.

    The aluminum could go fast, but not for an amateur. Even making mouseholes is in the learning curve. There is still lots of fitment of non-aluminum that will eat the clock.

  6. jamez
    Joined: Feb 2007
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    jamez Senior Member

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