reduce catamaran beam

Discussion in 'Multihulls' started by brendan gardam, Feb 11, 2020.

  1. brendan gardam
    Joined: Feb 2020
    Posts: 13
    Likes: 2, Points: 3
    Location: east gippsland australia

    brendan gardam Junior Member

    hi everyone. i have purchased an old crowther international 23 which is in great condition.
    i am toying with the idea of reducing the beam to 10 ft to make it trailerable without having to
    spend hours setting it up at the ramp. i know the sail rig will need new calculations and cutting down to suit. would it still be a reasonable performer with a 10 ft beam . if i was leaving the boat on a mooring i wouldn't consider doing this but i prefer to keep boat at home if possible. in australia we can get oversize permits for daylight travel up to 3.5 mts. just wondering what you think of this idea and if anyone else has done something similar. another option maybe a side tilting trailer like some racing cats use. don't know if thats practical though.
     
    Last edited: Feb 11, 2020
  2. bajansailor
    Joined: Oct 2007
    Posts: 571
    Likes: 125, Points: 43, Legacy Rep: 37
    Location: Barbados

    bajansailor Marine Surveyor

    Welcome to the Forum Brendan.
    When I googled your cat some photos came up which suggest that she is already very beamy for her length - I couldn't find any dimensions, but maybe 14'?
    If so, reducing the beam to 10' will be quite drastic.
     
  3. oldmulti
    Joined: May 2019
    Posts: 658
    Likes: 377, Points: 63
    Location: australia

    oldmulti Senior Member

    Brendan. You said the oversize permit allows you to trail a 3.5 meters wide or 11.5 foot wide boat. The International 23 in original format was 11.5 foot wide when expanded. No need to cut the beam down at all. Or if you want 10 foot (3.05 meter)beam just push the hulls together do a small screw or bolt to hold hulls at 10 foot. Yes the side shrouds will need to be altered at 10 foot but nothing else needs to change. Just be a little more careful when sailing the 10 foot wide boat. Hope you have fun.
     
    revintage and bajansailor like this.
  4. Alik
    Joined: Jul 2003
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    Location: Thailand

    Alik Senior Member

    can You carry the boat heeled, on trailer?
     
  5. rxcomposite
    Joined: Jan 2005
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    Location: Philippines

    rxcomposite Senior Member

    Yup. Saves a lot of trouble.
     
  6. brendan gardam
    Joined: Feb 2020
    Posts: 13
    Likes: 2, Points: 3
    Location: east gippsland australia

    brendan gardam Junior Member

    thanks for the replys. if its only 11ft5 then i don't need to do anything. thanks oldmulti. i thought they were 16 ft wide. i haven't opened it up yet. converting trailer to heel was another option but sounds like i don't need to now.
     

  7. brendan gardam
    Joined: Feb 2020
    Posts: 13
    Likes: 2, Points: 3
    Location: east gippsland australia

    brendan gardam Junior Member

    thank you, i have been a member of boat design forums but not for a few years. i read a post of oldmultis where he stated the 14 ft beam was a misprint.
     
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