Hydrocat Stringer repair

Discussion in 'Fiberglass and Composite Boat Building' started by capnkev, Apr 16, 2016.

  1. capnkev
    Joined: Mar 2013
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    Location: florida

    capnkev Junior Member

    I moved thread to here as it fits better.

    Hi I'm looking for some input on making repairs to a 29' Hydrocat stringer system.
    What we have is a grid stringer and bulkhead system set in putty. Most of bulkheads have cracked or broken loose. There was no consistency on the layup schedule or core. Some have nida core and some no core and about 1/8" thick.
    Should I remove grid make repairs or rip it all out and start from scratch making wood or foam bulkhead and stringers?
     

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    Last edited: Apr 16, 2016
  2. capnkev
    Joined: Mar 2013
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    Location: florida

    capnkev Junior Member

    Hydrocat

    Nobody has any comments on stringer repairs for this cat?
    Thanks
    Kevin
     
  3. Skua
    Joined: Apr 2013
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    Location: Hunt's Pier WW NJ

    Skua Senior Member

    Seems to me the bulkheads, and tabbing where not up to the job, unless there is some stringer failure I can't see.
     
  4. capnkev
    Joined: Mar 2013
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    Location: florida

    capnkev Junior Member

    Yes under built and improper core installation
    Would it be better to go back with conventual stringer and bulkheads or remove grid and rebuild with heavy layup?
    Thanks for reply
    Capnkev
     
  5. Skua
    Joined: Apr 2013
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    Location: Hunt's Pier WW NJ

    Skua Senior Member

    I would cut the bulkheads loose, grind out the putty and back to good glass, then tab the bulkheads back in with a proper laminate. I think maybe adding a layer or 2 where the bulkheads cracked through as well.
     
  6. capnkev
    Joined: Mar 2013
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    Location: florida

    capnkev Junior Member

    I also need to add a stringer to each hull as the bottom oil cans in between bulkheads, I can remove the box gutter shape they used to connect bulkheads and run some prism beams I have to the centerline.

    The bulk heads would have to be modified as the nidacore that was installed has a 90degree termination with no filler so laminate cracked at the end of the core where they draped glass over it.

    Thanks for response Skua
     

  7. Skua
    Joined: Apr 2013
    Posts: 147
    Likes: 5, Points: 18, Legacy Rep: 73
    Location: Hunt's Pier WW NJ

    Skua Senior Member

    Hmm ok then, sounds like entire construction is too light. Putting in a stringer may or may not be a good idea. I'm not an NA, so I can't speak to that level , but certainly if you have oil canning the laminate is far too light, for the stress levels. Certainly additional thickness seems in order.
     
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