Lion 800 new plywood yacht

Discussion in 'Boat Design' started by Unik, Jul 22, 2016.

  1. Unik
    Joined: Dec 2015
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    Unik Senior Member

    We are currently working on drawings for CNC cutting so the exact number of sheets I can not name, it will be about 25-30 sheets of plywood the size of 2440х1220 thickness of 6-9 mm
     
  2. Unik
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    Unik Senior Member

    For Lion 550 Adrenaline was the design of the keel box in the embodiment with a lifting ballast keel or a light centerboard and internal ballast.
     

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  3. rwatson
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    rwatson Senior Member

    That daggerboard takes up a lot of room internally, and interferes with the underside of the forward deck.

    What are your thoughts on a pivoting centreboard ?


    That mast compressin post is also a major interferance with the forward berth.
    What are your thoughts on a substantial mast beam support instead of the compression post ?
     
  4. Unik
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    Unik Senior Member

    Hi Ray, actually keel box takes up very little space 450х100х350 mm. in case of installation of the pivoting centerboard it will occupy three times more space. The yacht keel box will be hidden under a folding table. For easy installation of the masts spurs of the mast is on deck, so to ensure the strength under it installed pillers.
     
  5. rwatson
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    rwatson Senior Member

    Hi Yuri

    Yes, the keel box doesnt take up much space. Its the vertical Dagger Board itself that gets in the way of the forward berth. The forward berth is the prime sleeping place in these small boats, and sleeping and getting in and out is of prime importance.

    Also, getting the Dagger out of the Box can be a nuisance, and then finding some place to store the thing is also a pain in these little boats.

    The Centreboard takes up the equivalent size, inside, but in a far more convenient, low place. ALSO - when hitting an object when sailing, it can swing back.

    Heres a couple of drawings to illustrate :)
     

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  6. Angélique
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    Angélique aka Angel (only by name)

    -
    For some uniformity of terminology, so we'll have less confusion in case this board topic further develops, here some generally accepted terms for different kinds of boards...

    Sail Magazine ---> Some Common Centerboard and Daggerboard Designs

    - P.S. - - In general:

    When there's talk about a centerboard without further specifying the type, then in general a pivoting centerboard is meant.

    When there's talk about a daggerboard without further specifying the type, then in general a vertical sliding board that's able to fully retract within it's casing at bottom side is meant.

     
  7. Angélique
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    Angélique aka Angel (only by name)

    -
    Another idea is to have 2 off center board trunks build below the seats / bunks and have 2 off center boards, or have this as a build option.

    The 2 off center board trunks could be build a bit canted outside, somewhere in between 15° ~ 20° or so.

    And maybe also have a bit toe in, somewhere in between 1° ~ 2° or so.

    Pros & Cons of these double off center boards vs. a single center board:

    + more space in interiour.
    + better and more efficient leeway resistance ---> reasons see quote bilgeboard:
    - adds complexity to the build.
    - adds costs to the build.
    - adds building time.
    - adds weight.
    - less storage space below the seats / bunks.
    - have every tack to switch between the boards.
     
  8. Angélique
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    Angélique aka Angel (only by name)

    -
    Another idea for the Lion 800 boards, which adds even more complexity to the build , is to have 2 very low bilge keels with build in pivoting boards, similar to a stub keel with center board, but lower and placed at the bilges.

    I'll look for an example which I've seen a few years ago on a nearby dried out yacht of the Royal Netherlands Naval Yacht Club . . :cool:
     
  9. Angélique
    Joined: Feb 2009
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    Location: Belgium

    Angélique aka Angel (only by name)

  10. Angélique
    Joined: Feb 2009
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    Location: Belgium

    Angélique aka Angel (only by name)

    -
    Some more info about the above boat...

    K M J C = Koninklijke Marine JachtClub = Royal Netherlands Naval Yacht Club

    [​IMG] Watergeus PDF is in Dutch - It has a drawing of the boards unfolded from the bilge keels.

    [​IMG] KMJC journal 1-2012 PDF is in Dutch - Quote is from page 20 (PDF page 22)

    Watergeus Dutch

     
  11. tane
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    tane Junior Member

    ...lets see what you come up with in the search of the maximum possible complexity...
     
  12. Angélique
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    Angélique aka Angel (only by name)

    -
    At least I give note of the added complexity of what I come up with . . ;)

    P.S. - And I don't go for the max here . . ;)
     
  13. Unik
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    Unik Senior Member

    Аctually not so bad :), Lion 550 is designed as easy to build boat, so I chose option two dagger board and lifting keel, keel box is level with the seat and does not occupy much space, it is very simple to manufacture and operate. Using a different design centerboard boat will complicate and increase the cost. The Lion 800 probably use bilge keels, but simple design with no moving parts. I think that everyone in the boat should be very simple and very reliable.
     

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  14. tane
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    tane Junior Member

    looks far forward, that keel, btw...
     

  15. TANSL
    Joined: Sep 2011
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    TANSL Senior Member

    Suggestions are not allowed here. It is about that we admire what is being done.
    By the way, without a polemic but looking for what is not obvious to me, I dare to ask why can you say that the construction of this boat is very simple compared to other similar ships?. Thank you.
     
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