DynaRig MotorSailer, ala Maltese Falcon

Discussion in 'Motorsailers' started by brian eiland, Mar 9, 2007.

  1. brian eiland
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    brian eiland Senior Member

    Furling Square Sails

    I understand where you are coming from, but remember I am not asking these sails to 'reef' (partially furl). They are either fully deployed or fully rolled up. The relatively short lengths of these individual 'mid girth wires' is much shorter than std forestays. Some of the synthectic riggings are much better in torque than 'rope'.
     
  2. brian eiland
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    brian eiland Senior Member

    Actually I'm coming back to the idea of just using 'solid rod' for these 'mid girth wires'....can be relatively small dia, so not that much more weight, handles the variation of load/no-load better than synthetics, and is cheaper and longer lasting than syns
     
  3. brian eiland
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    brian eiland Senior Member

    'Dyna Cat' Press Release

    I received a rather nice press release in an up-scale yachting publication just recently

    Dyna Cat
     

    Attached Files:

  4. yipster
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    yipster designer

    compliments, thats a very very good article
    did you see the rough ladybird pdf i made?
    okay inspired but many paralel thoughts :cool:
     
  5. mydauphin
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    mydauphin Senior Member

    Yipster, Great Ladybug PDF. Hope you build it one day. I like concept - I wonder how concept could be adapted to a large monohull ... How much sail is needed to move a 70 footer that weights 70,000 at 7-9 knots.
     
  6. yipster
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    yipster designer

    thanks mydauphin, ehr.. think others here can answer that question better and faster but did order marchaj's books.
    forexample procyon has a strikable bipod. like making some schetches to see what aspects of concept to alter and have some L/B and deck dimensions.
     
  7. charmc
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    charmc Senior Member

    Congratulations, Brian, that's a nice writeup. Hopefully good for business!
     
  8. charmc
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    charmc Senior Member

    Beautiful design, Yipster. Hope you get the funds to build it!
     
  9. Guillermo
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    Guillermo Ingeniero Naval

    Congs, Brian. As I told you, I like your DynaRig Cat concept. Good luck!
     
  10. SeaSpark
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    SeaSpark -

    Dynarig sloop

    In one of the Yachting World articles about Maltese Falcon was a detailed explanation by Gerard Dijkstra about why the Dynarig is not suited for a sloop configuration. As far as i can remember the main reason was the the inability to trim lateral sail balance.
     
  11. yipster
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    yipster designer

    eh, ah, that my ladybird can, reefing in stages tho
    this beeing the intruded thread this idea got up why not a short animation
    [​IMG]
     
    Last edited: Jan 26, 2008
    1 person likes this.
  12. Pericles
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    Pericles Senior Member

    SeaSpark,

    Have searched Yachting World for article about Maltese Falcon, but cannot find it. Could you post more information please?

    Pericles
     
  13. Pericles
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    Pericles Senior Member

  14. Landlubber
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    Landlubber Senior Member


  15. Pericles
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    Pericles Senior Member

    LandLubber,

    She's a real beaut!:D

    More years ago than I care to remember, I learned about a square rigged topsail gaffer schooner that used a pulley system to deploy the rectangular sail, outwards from the foremast, on rings sliding along the upper and lower spars. I've been thinking it was Joshua Slocum's design, but I can't be sure.

    The sail could be set or reefed in seconds, like pulling curtains. With a bit of tweaking it would not be too difficult to emulate the Dyna Rig by laminating the spars from marine ply and epoxy, to create a 12 degree arc and then rigging the sails, top and bottom in sail tracks. A bit of muscle power on inhaul and outhaul sheets, passing down to the deck from the outer ends of all the spars and which are then cleated off, would position the rotating mast for upwind work. A car disc brake at the base of the mast would lock things quite securely. This square rig system is only suited for broad beam fast catamarans, as Brian Eiland has so effectively demonstrated, because although the mast rotates, it is still supported by very widely positioned stays.

    OK, so there are a few more ropes, but we are sailors after all. It's what we do, haul 'em up, reef 'em in. :( :( :( Also, I must have a mainbrace to splice and a yard arm for hanging pirates.:p :p

    Avast behind, me hearties!

    Pericles
     
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