Sea Sled madness. It’s in my brain.

Discussion in 'Fiberglass and Composite Boat Building' started by DogCavalry, Nov 11, 2019.

  1. DogCavalry
    Joined: Sep 2019
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    DogCavalry Senior Member

    Yes. Plywood bulkheads filleted to the hull. The entire space is watertight, sealed.

    We had pages of discussion about exactly this, immediately after the freeing ports discussion.
     
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  2. fallguy
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    fallguy Senior Member

    I don't have a c.v., but afaic loads don't need to be transferred from floors to hulls sides to that degree; those spans are way less than needed and I noticed they are at spans less than floors anyhow

    too tired..need zzzs

    edited--Oh my. Between rushing and sleeping, I'm real helpful..
     
    Last edited: May 10, 2021
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  3. DogCavalry
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    DogCavalry Senior Member

    Don't forget all the heavy cargo goes right there. Ad Hoc's talk of hull accordion failures really had me sharpening my pencil. Given the time and budget, I'm sure a decent NA could come up with something far more elegant and well proportioned. This complicated assembly definitely has areas of disproportionate strength and weakness.
     
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  4. DogCavalry
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    DogCavalry Senior Member

    20210509_180336.jpg
    Tentative doorframe mockup.
     
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  5. fallguy
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    fallguy Senior Member

    I am not a fan, but hopeful you can pull it off. For me, making an angled door is just too painful. Hinge locations, function, all too difficult. I'd have just made a straight section there. But that is boatbuilding. Each builder gets to do their own elements. Good luck on it.

    You will want to both epoxy bond and glass the door frame, but probably preaching to the preacher.
     
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  6. bajansailor
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    bajansailor Marine Surveyor

    I can't remember all the details of the discussion re this door - but was a two part door, opening outwards, considered?
    The window section could fold back on to the adjacent windscreen, and the lower section against the bulkhead?
     
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  7. DogCavalry
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    DogCavalry Senior Member

    The door will be 1 piece, sliding to port on upper and lower tracks. Door will overlay the frame all around, so it can be pulled inward, compressing gaskets when closed.
     
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  8. DogCavalry
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    DogCavalry Senior Member

    20210511_153148.jpg 20210511_153917.jpg
    Half lap mitered joints. Hammer and chisel work.
     
  9. DogCavalry
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    DogCavalry Senior Member

    And I'm changing the name of the boat to Leo Prinsloo. Just for the day.
     
  10. Ad Hoc
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    Ad Hoc Naval Architect

    Remands me of my O-Level woodwork joints we did... :rolleyes:
     
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  11. bajansailor
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    bajansailor Marine Surveyor

    I just realised that I do not watch much news - I had to ask Google who Leo was.
    At first I thought you might have been referring to a take-off of Leo who is restoring Tally Ho -
    https://www.youtube.com/channel/UCg-_lYeV8hBnDSay7nmphUA

    But then I cottoned on that this Leo is the security guard who outfoxed the bandits trying to ambush him.
    Fears for South Africa security guard's safety after escaping ambush https://www.bbc.com/news/world-africa-57040115
    What a hero! I just hope that the bandits don't find him now that he is famous.
    I am sure that he would be honoured to have a Sea Sled named after him (even if it is just for a day). :)
     
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  12. DogCavalry
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    DogCavalry Senior Member

    I think his family is in real danger now.

    They should be running Q ships.

    Otoh, I wish you were here, John. I could use another skilled pair of hands.
     
  13. DogCavalry
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    DogCavalry Senior Member

    I don't like half lap joints: there's an abrupt point of weakness in both components. Bad design.
     
  14. bajansailor
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    bajansailor Marine Surveyor

    Are you gluing them with epoxy (and also using screws?)?
    If there is lots of bonding surface area, then they should be pretty strong?

    Your chisel work is pure art (intended as a compliment).
     
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  15. DogCavalry
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    DogCavalry Senior Member

    Yes, I'll prewet them, load the intersections with epoxy/cabosil, and screw them. Then thin plywood over the open side of the joint, down to the hull as a complete filleted bulkhead, making 5 in a 68" space. I'd love to have a real NA here to help with structural analysis, but I'm already humbled by you gentlemen's open handed generosity with your time. So I'm ensuring that whatever loads I place in this cockpit, they are spread as evenly as possible throughout the structure, avoiding stress concentrations. It is certainly overkill in places, as Fallguy corrrectly opined, but which places?
     
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