Sea Sled Madness: It's Incurable

Discussion in 'Boat Design' started by DogCavalry, Dec 22, 2022.

  1. Ad Hoc
    Joined: Oct 2008
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    Ad Hoc Naval Architect

    We have a nice boxy hull form in our large database menagerie....ostensibly a fast landing craft hull form.
    I'd be more than happy to offer this to John, if he wants to use it, rather than a SS.
     
  2. DogCavalry
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    DogCavalry Soy Soylent Green: I can't believe it's not people

    Ha! The number of times I have ridden back from a job site, when Anne says "take the wheel" and a moment later I hear the sound of a beer opening...
     
  3. DogCavalry
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    DogCavalry Soy Soylent Green: I can't believe it's not people

    Very kind of you, @Ad Hoc , but I am, despite hickups, extremely pleased with Serenity thus far. @bajansailor , the SOR called for 600kg in pax and cargo. Out of reach of any catamaran.
    @fallguy , you are surely correct: if I loaded the new boat to such an extent, I would have to give a lot of thought to load distribution. No boat is magic. Not even mine.
     
  4. bajansailor
    Joined: Oct 2007
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    bajansailor Marine Surveyor

    Oops, sorry, I missed that bit in your earlier post about the 600 kg cargo capacity.
    This wee 6 metre Poleson cat might be able to cope with 600 kg?


    Poleson Marine LTD https://www.facebook.com/polesonmarine/

    Thanks to (I think) @RSD for the heads up about the Poleson boats - I had not heard about them before.
     
  5. DogCavalry
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    DogCavalry Soy Soylent Green: I can't believe it's not people

    I don't think I could build that...
     
  6. bajansailor
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    bajansailor Marine Surveyor

    Not even in stitch and glue plywood?
    Ok, the hull design would probably have to be tweaked a bit, but if they can wrap ally around this hull shape, then plywood should wrap as well?
    I just thought that this was a good example of a 'quart in a pintpot' type of small powercat with good load carrying capacity.
     
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  7. DogCavalry
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    DogCavalry Soy Soylent Green: I can't believe it's not people

    It is indeed a good example.
     
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  8. Barry
    Joined: Mar 2002
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    Barry Senior Member

    And that there is an excess of air ingrained water due to the shape of the hulls funnelling the mixture into the prop path
     
  9. baeckmo
    Joined: Jun 2009
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    baeckmo Hydrodynamics

    Correct per se, but the aeration is part of the SOR in this case. Its implications however, have not been correctly catered for during the propulsor selection and application procedure. Here, the devil hides in the tiny details!
     
  10. fallguy
    Joined: Dec 2016
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    fallguy Senior Member

    Could you just move the engine to port and run offset the helm?
     
  11. DogCavalry
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    DogCavalry Soy Soylent Green: I can't believe it's not people

    Maybe so.
    Or a pair of 25s. Hmm, can an engine as small as a 25 be installed without a tiller?
     
  12. baeckmo
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    baeckmo Hydrodynamics

    Yes, but why bother when a single, correctly installed and with the right prop, works perfectly fine? Don't keep wasting time on all these speculations and guesses, there are more challenging issues up front to deal with!
     
  13. DogCavalry
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    DogCavalry Soy Soylent Green: I can't believe it's not people

    You are correct, as always.
     
  14. fallguy
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    fallguy Senior Member

    Well, the last I remember there was a drawing of some water diversion structure on the hull, so I don't see the problem with asking. I did not know it was a prop and height issue only.. A friendly question is not a speculative guess.
     

  15. DogCavalry
    Joined: Sep 2019
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    DogCavalry Soy Soylent Green: I can't believe it's not people

    Actually he means me. I'm like a dog that... "Squirrel!".... can't stay on topic.
     
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