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hull-keel join

Discussion in 'Technical Discussion' started by tirekicker11, Nov 16, 2011.

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  1. tirekicker11, Nov 16, 2011
    #1
    tirekicker11

    tirekicker11 Senior Member

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    "A small gap was seen in the trailing edge at the joint between the hull and keel. This gap disappeared when the vessel was set on her keel and no sign of loose bolts were noted. This gap appears as a result of the hull flexing longitudinally. This is a normal phenomenon with a Beneteau and has been observed in many other similar vessels."

    Can anybody here confirm this 'phenomenon'?

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  2. Ozzie, Nov 16, 2011
    #2
    Ozzie

    Ozzie Member

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    I've heard of the Catalina Smile, sounds like it could be similar.
  3. tirekicker11, Nov 16, 2011
    #3
    tirekicker11

    tirekicker11 Senior Member

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    What I'm realy after is to find out whether this 'smile' should be considered a 'normal phenomenon' or structural damage that needs repairing.
  4. Yachtjocky, Nov 16, 2011
    #4
    Yachtjocky

    Yachtjocky Senior Member

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    smile

    Alot of people stopped making that a "hard" joint and instead cleaned it out and used a soft mastic like sealant to allow it to move
  5. Ozzie, Nov 16, 2011
    #5
    Ozzie

    Ozzie Member

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    google Catalina Smile for the indepth discussion on this
  6. tirekicker11, Nov 16, 2011
    #6
    tirekicker11

    tirekicker11 Senior Member

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    I read that the 'Catalina Smile' is caused by plywood reinforcement in the hull. I don't know whether plywood has been used in this Beneteau. This Beneteau has an internal glued in GRP stiffening grid that may have been compromised by a possible grounding. Though I have reason to believe that this smile has been witnessed before the damaging of the grid.
  7. Jason Ge, Nov 22, 2011
    #7
    Jason Ge

    Jason Ge New Member

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    At first, I think all the keel bolts and nuts are needed to be checked whether they are rusted or not, and the cored woods between the fiberglass surface of the bilge and the bottom hull fiberglass are also needed to checked whether they are rotten or not. Then, you could take the proper solutions accordingly. Hope it works.
  8. kligon, Nov 23, 2011
    #8
    kligon

    kligon New Member

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    I helped an owner of GRP 62ft sloop with simular problem, he was sailing Aegean, noticed a minor leaking around the keel bolts. He slipped at Icmeler we dropped the keel replaced the bolts and epoxied the keel seat.
    Reason is the keel has massive amount of energy that if not attached as firmly as possible to the hull it will if given a flexible mastic type seating glue begin to move as the bolts stretch
  9. tirekicker11, Nov 23, 2011
    #9
    tirekicker11

    tirekicker11 Senior Member

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    Good thinking but:
    All keel bolts have been replaced recently and appear to be tight,
    The hull is build in solid laminate, not cored, the glued in top hat stringer stiffening grid is also solid GRP
  10. Ozzie, Nov 23, 2011
    #10
    Ozzie

    Ozzie Member

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    Tirekicker,
    what/who is the source of the quote in your o.p.?
  11. tirekicker11, Nov 23, 2011
    #11
    tirekicker11

    tirekicker11 Senior Member

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    Sorry Ozzie, can't disclose. It's an 'authority' in the business.