proa or not?

Discussion in 'Multihulls' started by gaza, Jul 5, 2013.

  1. gaza
    Joined: Jul 2013
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    gaza Junior Member

    Hi Im new to the site .This is my first thread. Ok . I have a 7 metre by 8 foot beam displacement hull sail boat not finished,in the building of it . Its a foam sandwich job . I want to put a 16 ft out rigger on it about 8 ft from the main hull.and create a solid deck area for boom tent and extra space.Also I am wanting to sail up the east coast of australia and my thought was it would give me more stability .the outrigger is made of two 16 ft hulls one on top of the other like a mirror, to give heaps of volume and storage space. Has anyone seen anything like this before.? Most proas I see the larger hull is still narrow.not quite sure how to go about where to put everything any advice is welcome. Thanks Gaza.
     
  2. CutOnce

    CutOnce Previous Member

    I'd join the Proafile site and the proa_file Yahoo group. There is lots of expertise there. Although there are lots of opinions on proas, very few people have actually sailed one.

    Proa itself is actually a confusing term - and it doesn't mean the same thing to each person you talk to. If you want a good grounding in the terminology lumped into the label "proa", you might want to buy Gary Dierking's book from Amazon.

    Shunters, Tackers, Pacific, Atlantic, Newick/Brown - these are all proas.

    --
    CutOnce
     
  3. waikikin
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    waikikin Senior Member

    Sounds interesting & unusual, any pictures?

    Jeff.
     
  4. gaza
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    gaza Junior Member

    thankyou ill go have a look at the proa file yahoo.group.and maybe check out the book
     
  5. gaza
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    gaza Junior Member

    no pics just yet
     
  6. spidennis
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    spidennis Chief Sawdust Sweeper

    and you can talk to Gary on the forums once you get there!
     
  7. tspeer
    Joined: Feb 2002
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    tspeer Senior Member

    Instead joining the outrigger hulls one on top of each other, why not join them end-to-end and create a 32 ft long outrigger? Then the entire volume of the outrigger could contribute to stability instead of just half of it.

    The main hull is quite wide by multihull standards. But I suppose you are too far along to make major changes to the shape of that hull.
     
  8. peterAustralia
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    peterAustralia Senior Member

  9. peterAustralia
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    peterAustralia Senior Member

    8ft separation from main hull, that aint much
    16ft would be more like it

    compared to main hull, the outrigger is very simple, for a 7m main hull, a 5 or 6m smaller hull would be the way to go
     
  10. gaza
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    gaza Junior Member

    Hi Peter
    Are you saying make the main hull smaller or just put more distance between the hulls?The out rigger is 2 hulls one on top of the other mirrored.
    thanks gaz
     
  11. peterAustralia
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    peterAustralia Senior Member

    I was referring to separation between the hulls (however I now take that back.. mistake by me). You have built your large hull, so hard to change that now

    so you have a 7m long main hull, which has a beam of 8ft. so thats 23ft long x 8ft wide. Thats a 3:1 ratio,,, hmmm pretty beamy for a multihull by anyones measure (6:1 would be way better)

    you could possibly scale this up a bit
    http://www.duckworksmagazine.com/09/projects/kejak/index.htm
    It is 21ft long, would give you an idea of rough proportions

    i think your in a mess to some degree

    a big outrigger makes sense, maybe 8ft separation could work, you already have an 8ft wide main hull, that gives you 16ft of overall beam, which looks reasonable for a 23ft multihull
     
  12. gaza
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    gaza Junior Member

    Thankyou Peter for your input I know it is a wide main hull thats the way it came as foam on the stations cant really change that now,any way if it doesn't do what I want it to do I can always use the boat as a mono. reards Garry
     
  13. CutOnce

    CutOnce Previous Member

    Garry:

    Given the beam of the vaka isn't negotiable, there is no reason why you can't still have a perfectly acceptable tacking proa from it. Rob Denney's Harryproas have a wide, shorter and heavier hull to windward matched with a long, narrow and light hull that has the rig to leeward.

    There really isn't any rules. Your finished boat will still gain many things from adding the outrigger - righting moment, stability, space and perhaps speed from the monohull option. It may not be as fast as a narrow hull double ended proa, but for your use that may not be an issue. A steady, reliable 7-10 knot cruiser where your world view isn't leaned over 45 degrees is a revelation.

    Bottom line from my perspective - built it, have fun, and know you'll probably still get to your destination faster than most lead-poisoned heavy, slow monohulls.

    Given your boat will be a tacker, the high volume outrigger will work really well on both tacks. I'd consider making the akas (cross beams) long enough to stick out five or six feet on the side without the outrigger to create a wide platform for staying the rig, as well as a nice additional deck space for storing a dinghy or whatever.

    --
    CutOnce
     

  14. gaza
    Joined: Jul 2013
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    gaza Junior Member

    tanks for the info I hadn't though about extending the akas out the other side I will be giving that some thought .At any rate as things progress I will start posting some pics.thanks again
    Gaz
     
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