Hydrocat Stringer repair

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

  1. capnkev
    Joined: Mar 2013
    Posts: 6
    Likes: 0, Points: 0, Legacy Rep: 10
    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?
     

    Attached Files:

    Last edited: Apr 16, 2016
  2. capnkev
    Joined: Mar 2013
    Posts: 6
    Likes: 0, Points: 0, Legacy Rep: 10
    Location: florida

    capnkev Junior Member

    Hydrocat

    Nobody has any comments on stringer repairs for this cat?
    Thanks
    Kevin
     
  3. Skua
    Joined: Apr 2013
    Posts: 142
    Likes: 5, Points: 18, Legacy Rep: 73
    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
    Posts: 6
    Likes: 0, Points: 0, Legacy Rep: 10
    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
    Posts: 142
    Likes: 5, Points: 18, Legacy Rep: 73
    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
    Posts: 6
    Likes: 0, Points: 0, Legacy Rep: 10
    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: 142
    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.
     
Loading...
Similar Threads
  1. Shawn Barlow
    Replies:
    2
    Views:
    106
  2. atengnr
    Replies:
    46
    Views:
    719
  3. E350
    Replies:
    38
    Views:
    1,055
  4. chowdan
    Replies:
    9
    Views:
    519
  5. Tom Mckinney
    Replies:
    1
    Views:
    322
  6. Aransas Flats Rat
    Replies:
    78
    Views:
    3,265
  7. andysailor
    Replies:
    1
    Views:
    443
  8. SecondChance248
    Replies:
    2
    Views:
    720
  9. Jeff_40
    Replies:
    4
    Views:
    1,006
  10. Jeff_40
    Replies:
    18
    Views:
    1,076
Forum posts represent the experience, opinion, and view of individual users. Boat Design Net does not necessarily endorse nor share the view of each individual post.
When making potentially dangerous or financial decisions, always employ and consult appropriate professionals. Your circumstances or experience may be different.