Historical multihulls

Discussion in 'Multihulls' started by Gary Baigent, Feb 26, 2012.

  1. Gary Baigent
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    Gary Baigent Senior Member

    Oh dear, us Kiwi jokers have been so wrong for all these years, I mean, black boats ... you know there are quite a few All Blacks here.
    Actually, the hulls may be black but usually the decks are off white or a light colour.
    Seriously a 34 foot mast on an 18 by 7.5 foot A Class with their narrow beam; that is asking for trouble. But so what, suck and see, live and learn. Now we know the limits.
     
  2. SukiSolo
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    SukiSolo Senior Member

    Having burnt myself on a black anodised alloy boom in the UK on a hot day, I don't like black finishes in hot sunlight. Hell that was not even near the Equator!.

    I'm interested in your comment Richard as that is exactly how I'd finish a carbon/epoxy mast. Some makers do and some don't, I've seen black painted too. The latter does protect from UV but still gets too hot for my liking. As far as I can work out, protecting epoxy from UV seems to work best for longevity too. So maybe it might be a fashion thing with bare or varnished carbon sported on vessels whose life is short ie a year or two, and it just trickles down.

    Well Gary, even over here in the UK, I know of a few black hull, white deck boats - owned by Kiwis!. Some even have a little white fern on 'em....;)
     
  3. Tom.151
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    Tom.151 Best boat so far? Crowther Twiggy (32')

    FWIW - I learned about UV damage to epoxy-glass sheathing over plywood the hard way. I'll try to attach a picture of the evidence.

    During the search for a solution I learned that conventional boat/marine topside paints provide insufficient protection (at least in tropical climes, I was in Florida USA at the time) - unless the paint is a "high solids, black paint" AS an aside there's on luxury boat builder that undercoat/primes their boats with high solids black paint - can't remember the name at the moment (senior moment that is).

    Okay, the attachment seems to have worked... the pict is of the horizontal cockpit coaming, which was Okume 1088 ply with epoxy coating and 6 oz glass over, then painted and then non-skin paint over that in places.

    When I discovered the glass was lifting in places, I exposed the surrounding area.
    Some places the glass was completely separated from the ply underneath (as in zero peel strength), other areas were the glass covering was fully bonded and nearly impossible to remove, and others in between.

    At last, I noticed the discoloration of the underlying plywood. I added notes to the picture. because the discoloration was so clearly demarked by straight edges it was possible to see that the coloration and the peel strength were directly related to the different areas providing differing degrees of UV protection. The most protection was underneath the genoa track (obvious huh) and the glass covering there was nearly as if it was new covering - had to sand the glass of in places under the track.

    For me at least - if you are in tropical conditions, you need to at least understand that this is really a potential and likely severe problem for longevity.

    Cheers,
    TomH
     

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  4. Ilan Voyager
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    Ilan Voyager Senior Member

    We are predating a thread about historical multis...Thanks Tom for your very interesting post: a direct long term experimentation about UV effects. I have remarked also that pearl paints give better protection as they are charged with mica which reflects the light, and the protection by the paint is far better when a grey or black primary is used. The so called anti UV varnishes are a joke, varnishes are for inside, out of the sun.
     
  5. upchurchmr
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    upchurchmr Senior Member

    Perhaps we need a mica filled varnish - on a historical multihull so we stay with the thread. :)
     
  6. Corley
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    Corley epoxy coated

    The Formula40 trimaran Biscuits Cantreau 4 suffered a complete main hull failure in Auckland soon after being refitted and put on the water. She is being rebuilt now and there is a facebook page that has been setup to follow the progress:

    https://www.facebook.com/profile.php?id=100005705925511
     
  7. buzzman
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    buzzman Senior Member

    Looks like it sheared at the point of attachment of the main forward aka.

    Seems odd that there would be only a single ring frame at that point, and that not continuing across the keel section of the hull.

    Is this just super light weight design, or I am being a typical DIY "over-builder".?
     
  8. cavalier mk2
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    cavalier mk2 Senior Member

    If it breaks it isn't overbuilt.....
     
  9. Corley
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    Corley epoxy coated

    Apparently It had some poorly repaired damage from a hard grounding which caused the hull failure. It's nice to see this boat having a renaissance anyway.
     

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  10. rapscallion
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    rapscallion Senior Member

    That is one beautiful trimaran! What are the specs? weight, sail area ect...
     
  11. hump101
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    hump101 Senior Member

  12. Corley
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    Corley epoxy coated

    Just a question on D class catamarans. It seems like an interesting box rule but was there ever a D class championship or was it just a few orphan boats that were built?
     
  13. Richard Woods
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    Richard Woods Woods Designs

    Funny you should ask that today

    Check here

    https://www.jibeset.net/show.php?RR=JACKY_T001455332&DOC=r101&TYP=html

    and you'll see two D class cats raced in the 3 Bridge Fiasco at the weekend. More on Latitude 38

    But I don't think many were built. Phil Weld had one, so too did the Dashews. Before their time I guess. However I do remember several C class cats fleet racing in Cowes Week in the early 1960's

    RW
     
  14. Corley
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    Corley epoxy coated

    Thanks Richard, very interesting looks like they correct out well under handicap too.
     

  15. Richard Woods
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    Richard Woods Woods Designs

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