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Thread: Starting a multihull project

  1. #1

    Default Starting a multihull project

    Hello,
    I'm very passionate about catamaran sailboats and it's my goal to build one in the next 10 years, which would serve us as a liveaboard for my family. I was heavily inspired by a Swedish couple that had built the G-sail 51 ( http://g-sail.ch/ ).

    I have been doing some research for a while but I have no experience, so I need to start somewhere.

    Basically I'm looking for directions on where to start.

    I have plenty of time to learn, however do you think that my goals are realistic and what is the optimal way to go on about this?



    In terms of design, I'm aiming for something between 50-60 feet, preferably
    avoiding a skyhigh mast but something more manageable. I'm more interested in this vessel as a liveaboard (big living quarters), so performance is not vital for me.
    Essentially I'd like incorporate my ideas of innovative features and comfort, while keeping the boat simplistic.
    I'm very much inspired by the lines of this vessel
    ( http://www.aeroyacht.com/wp-content/...01-620x310.jpg ), even though I understand it's 150' and it enters a completely different category.
    I'm interested in using Aluminium as a building material, as from what Ive gathered its easier to maintain if done right and it has less problems in the long run.



    I appreciate all your suggestions, critique and ideas regarding my plan.

  2. #2

    Default Re: Starting a multihull project

    If you are just living aboard, skip the mast and sails. A power cat will cost less and deteriorate less while at the docks.

  3. #3

    Default Re: Starting a multihull project

    That is not the idea though. I love sailboats, motoring is something I'm simply not into.

    Could anyone suggest where I could find information on building methods, hull structure, pretty much just looking for a starting point of understanding different designs, building materials etc.

  4. #4

    Default Re: Starting a multihull project

    Quote Originally Posted by Defyant View Post
    That is not the idea though. I love sailboats, motoring is something I'm simply not into.

    Could anyone suggest where I could find information on building methods, hull structure, pretty much just looking for a starting point of understanding different designs, building materials etc.
    Yeah, but going by your post, this is a live aboard with no consideration foir sailing. If you have a 50 or 60 foot cat with a short mast that will fit under all bridges, you will be doing NO sailing anyway, since it will take a hurricane to get the thing moving.

    Furthrer, if you are sitting at a dock, you aren't sailing.

    Why do yoy want to spend the nearly $20,000 it costs to rig a cat of that size just to watch the sails rot?

    Sorry, coming at this from the "been there, done that, many decades of experience" angle. Reality check. You will arrive at these same conclusions after you read. Google "boat building methods" to get started.

  5. #5

    Default Re: Starting a multihull project

    Aluminum is a very tough material for a novice to work with. The welds are softer than the plate material and getting it smooth and fair will be tedious. Start your welding apprenticeship now so you will be ready when the time comes in 10 years.

    Or make your life really easy and just do strip planking. No experience required.
    https://www.google.com/search?q=stri...w=1092&bih=513

    And the free users guides from West Systems. There's one in Swedish, too.
    http://www.westsystem.com/ss/use-guides/
    Last edited by Sand crab; 4th April 2014 at 09:44 AM.

  6. #6
    Join Date
    Jul 2009
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    Gosport
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    349

    Default Re: Starting a multihull project

    That is a much bigger boat than most people build themselves and aluminium would need some specialist skills such as welding and metal fabrication.
    Depending on your skills you might want to consider having the main structure built and then fitting it out.
    The other option to consider is to look for a second hand boat and do a complete re-furb.
    Depends on your time and commitment. There are a lot of much smaller boats laying around unfinished. That is a very big boat to build!

  7. #7

    Default Re: Starting a multihull project

    Quote Originally Posted by Defyant View Post
    Hello,
    I'm interested in using Aluminium as a building material, as from what Ive gathered its easier to maintain if done right and it has less problems in the long run.
    There is no perfect material.

    Aluminium even if you get it right and you forget to put an anode out, or drop a washer in the bilge and you could be sunk, literally. Condensation, linings, fairing, welds, not simple.

    Do you want to build or go sailing? A boat of the size you are looking at may take 15-20000 man hours. To put that in context a self employed tradesman will typically bill 1000 - 1500 hours per year.

    Check out Richard Woods website lots of good stuff about self building.

  8. #8
    Join Date
    Aug 2013
    Location
    Fremantle, Western Australia
    Posts
    292

    Default Re: Starting a multihull project

    My thoughts on building a 50-60ft cat - all I can say is good luck! You will need really deep pockets as this will cost a fortune. The first thing to do is hire some charter cats to work out what you need. But to start off cold and go into a build of this size is pretty major. You could buy a second hand cat for less than half the cost of building one. About 18 years ago, I thought I could build a sailing boat cheaper than I could buy one. I stopped work and put 2-3 years solid work at 8-12 hours a day on the boat and managed to get it launched way over budget and that was without counting my time in the build. I would not recommend going into a build without working out all your logistics such where do you keep the boat while you are building it, do you have a 500mē shed? If not you have to work out the cost of this. The longer the build the more it costs. And there are so many second hand cats cheap in fibre glass and aluminium, you could spend the next few years looking and the dressing it up to suit you and your family.
    L&N

  9. #9

    Default Re: Starting a multihull project

    Thank you for the input.
    I'm taking all your comments into consideration.

    I've been exploring another angle which is having the boat built to specifications. For example I really like the Freeflow 46 design (you can look it up it's fairy new)
    If I could add my ideas onto it, change the top half, it would probably suit all my needs.
    They sell the plans for it (even though at a pretty steep price).

    Is there a way that this could be done? A builder that could do this for me?

  10. #10
    Join Date
    Aug 2013
    Location
    Fremantle, Western Australia
    Posts
    292

    Default Re: Starting a multihull project

    It al come back to Money

    Link http://www.mc2catamarans.com/

  11. #11
    Join Date
    Aug 2013
    Location
    Fremantle, Western Australia
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    292

    Default Re: Starting a multihull project

    They can build these for you in Thailand and do whatever you want to the inside as in way of design.

    Link: http://au.yachtworld.com/boats/2012/...d#.Uz-Q_7WKB6p

    L&N

  12. #12

    Default Re: Starting a multihull project

    Quote Originally Posted by LouisAndNatasha View Post
    They can build these for you in Thailand and do whatever you want to the inside as in way of design.

    Link: http://au.yachtworld.com/boats/2012/...d#.Uz-Q_7WKB6p

    L&N
    These are built in Sri Lanka not Thailand.

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