CSC 30 Catamaran- the coastal passage

Discussion in 'Multihulls' started by peterchech, Nov 29, 2011.

  1. fallguy
    Joined: Dec 2016
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    fallguy Senior Member

    Okay. Let me take a shot.

    A 2x6 pine board versus a 4x8 aluminum crossbeam.

    calculate the moment of inertia of each of them...you can get the 4x8 from a datasheet from a similar sized Charleston/US Spar

    the 2x6 builds pretty fast; the odd shaped ally mast requires making a fancyish mould or at least using the mast as a plug

    I can break the 2x6 by hand if you don't feel like doing the work.

    Sometimes, simple is too simple and has a major tradeoff.
     
  2. fallguy
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    fallguy Senior Member

  3. sailhand
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    sailhand Senior Member

    Hi I do not wish to go into specifics, if you are determined to build one you will. I will only say that the amount of crying by one couple that owned one of these was both heart wrenching and embarassing. I went into specifics about this design previously on this forum and was warned by the moderators I have no intention of repeating the episode. What I will say as a sailor, owner, designer and builder of many years experience is two things.
    1/ the best investment you can make when building a boat is not carbon sails or digital radar or a pretty paintjob or leather upholstery it is the Design. That is what will make or break your project more than any other single factor. It is the foundation of your whole project, and trust me on this one point, not only will you SAVE heaps of money you will make a whole heap more later. Dont have a foundation of quicksand and expect a good result. Dont believe me, go and look at your local boat ads, see what reputable sought after designs sell for compared to somebody's wet dream turned nightmare. The nightmares all have one thing in common, an owner who thought he knew better than everyone else spent a fortune building and rebuilding and repairing and crying. Not everybody ends up this way but 99% do, with the odd exception that makes the rule. Peoples dreams and ambitions should be encouraged however a little nudge in the right direction is always useful if somewhat difficult. I hope you have the best boat the best time sailing it and many happy memories from the whole experience and the help and advice of people that have designed and built countless numbers of boats and spent years sailing them will help you acheive that goal.
    2/ read number 1 again and again and again and again................
     
    Last edited: Nov 10, 2020
    brendan gardam likes this.
  4. brendan gardam
    Joined: Feb 2020
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    brendan gardam Senior Member

    Very well written reply.. When i read this i thought of how many people join this forum every year with one thing in common. No boating or boat building experience yet they have come up with a revolutionary design which is going to set a new standard. Still waiting to see one of these advanced vessels .
     
  5. Mr Efficiency
    Joined: Oct 2010
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    Mr Efficiency Senior Member

    I have often thought of ways that would streamline the building of such a boat, but I certainly would not settle for anything that compromises safety, and at bottom, that is what seems to be the fundamental objection here, that it isn't as safe as a boat of this type can, and should be. To describe the boat as limited to coastal and smooth waters, as the designer did, is a strange limitation to put on a boat of this size and type.
     

  6. Dorydude
    Joined: Aug 2017
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    Location: Auckland

    Dorydude Junior Member

    Yes it is a strange limitation as the boat seems quite reasonably built.
    Yacht design isn't exactly voodoo as many here seem to think.
    All throughout the world the most basic multihull craft are used offshore every day.
    Quite seaworthy boats are constructed out of hollowed logs, bamboo, pvc pipe etc , and they are often lashed together with cheap polypropylene rope IMG_20191027_161236822_HDR.jpg

    I remember going on a big Wharram that was hanging out in Musket Cove (Fiji) for years. 30 years old - polyester over ply.
    Making styrene based resins adhere well to timber is definitely a difficult task, but it is far from impossible for someone with the right skills.
    It's pretty damn easy for an inexperienced builder to screw up an epoxy clad boat as well. Epoxy isn't magic, and it doesn't take too much vulnerable/ exposed endgrain or badly sealed fastenings to condemn a boat to an early end.

    I also have found that a great many issues with multihulls relate to owners piling too much weight on them . Cats are generally not good load carriers, yet have an abundance of space ...a recipe for trouble...yet the designer will invariably be blamed.
     
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