24ft power cat design

Discussion in 'Boat Design' started by ecojet, Jan 20, 2017.

  1. ecojet
    Joined: Jan 2017
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    Location: NSW Australia

    ecojet Junior Member

    My very first idea for a small outboard powered cat was using a pair of tornado hulls.:D

    Then we needed to add some comfort and usability to it, hence this thread.

    Cruising Australia with Norm & Pip - https://www.youtube.com/watch?v=LPXNX6D521Q Nustar cat with twin 50hp diesels, not bad at all but a lot bigger than I want at this stage and we need more speed, 6 or 7 knots is fine if your retired and have all the time in the world also the build time for a 40ft cat would be at least three times longer than 24ft.

    If I wanted a 40 ft cat I would buy a shell mostly completed, they come up every now and then for sale, I almost bought a 45ft commercial cat up near Cairns, a victim of cyclone Yasi but too big a job to repair when you live 2000kms away.
     

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  2. ecojet
    Joined: Jan 2017
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    Location: NSW Australia

    ecojet Junior Member

  3. Mr Efficiency
    Joined: Oct 2010
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    Location: Australia

    Mr Efficiency Senior Member

    What don't you like the look of ? The reversing sheerline ? It is a planing hull, low weight seems to be the key to getting it to perform. I can't tell from the picture whether the hulls are symmetrical, though possibly not. The deck clearance of 16" seems a lot. Lightweight planing cats can get quite scary at speed, I guess this one can't go fast enough with the small engines for that to arise.
     
  4. ecojet
    Joined: Jan 2017
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    Location: NSW Australia

    ecojet Junior Member

    I think it must be the reversing sheerline, makes it look a bit odd to me, other than that it's all good.
     
  5. sailhand
    Joined: Jan 2017
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    Location: australia

    sailhand Junior Member

    Ecojet I can supply you with contact details of a current owner of a spirited 230 suffice to say don't even think about it the leech is sooo much better it's not funny.
     
  6. ecojet
    Joined: Jan 2017
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    Location: NSW Australia

    ecojet Junior Member

    That's ok Sailhand, I'm going to go with my own design as I like a challenge but it would be interesting to know what the issues are with the 230.
     

  7. Phlames
    Joined: May 2017
    Posts: 21
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    Location: Melbourne, Australia

    Phlames Junior Member

    I was intrigued with the tornado(?) hulls pictured. I have a pair of old tornado hulls that I want to use as a fishing platform. The photos show a scale (roughly made) model of what I had in mind and include a 30hp to scale and a 'person' about 1.8m tall. While I would like to centralise the weight, I think the outboard position is the best compromise and it frees up the fishing space. The pod is about 3.6m long and 2m wide and I think the all-up weight would be about 400 Kg including two adults giving about 20 knots speed. I apologise for the thread drift but I think it is obvious that many facets of your requirements and my design are similar except for the comfort of an enclosed cabin. I would be interested in comments about my design.
    IMG_1426.jpg IMG_1428.jpg

    < note: new thread under 'Re-using old catamaran hulls' for discussion of this design >
     
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