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Building a junk rigged Matt Layden's Paradox

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  • 08 Sep 2015 16:25
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    Reply # 3515698 on 3508588
    Anonymous member

    I'm very interested in your project.  Here's a little sketch I did for Annie Hill's “Sib-Lim Challenge” thread showing very roughly the sort of radical design I'm thinking about for the future: metal base, chine runners, junk rig. It's just an idea at present. Other people have expressed skepticism that chine runners will scale up, or work well with junk rigs, so some sort of proof would be excellent.

    But if I were in your position I'd be trying to find someone with a Paradox and someone else with a small junk rig and put them together to see what happens, before I got far in to building one. We're all bound to learn something from that.

    Talk to JRA member Jim Hall about his Paradox, Faith.  I met him earlier this year and took these pictures.

    Last modified: 08 Sep 2015 17:06 | Anonymous member
  • 06 Sep 2015 18:09
    Quote
    Reply # 3512712 on 3512602
    Deleted user
    Hi Robert,

    Thank you for sharing your thoughts! I have understood that chine runners also give some lateral resistance, just the boat has to be heeled for that. I try to move CE as little forward as possible, but you can easily be right, I may need something exotic. First choice would then be leeboard.

    Regards,

    Eerik
  • 06 Sep 2015 15:01
    Quote
    Reply # 3512602 on 3508588
    Anonymous member
    eerik mee wrote:

    I had to move the mast a bit forward, to get to step it a bit lower, but also to avoid boom (and battens) to overhang the transom.

    I had a Paradox, considered converting to junk rig because the existing lug rig was inefficient upwind, but decided against it.  Most of the lateral resistance comes from the rudder.  Moving the rig forward takes pressure off the rudder, just as sailing upright does, and sailing upright dramatically increases leeway.  My opinion is that you will either need a mizzen, a bow board, or something more exotic.  I considered something resembling the foils on the new Open 60s, but hinged instead of sliding out of the hull.  I would have mounted them as far forward as the mast.
  • 03 Sep 2015 12:36
    Quote
    Message # 3508588
    Deleted user

    Hi,

    As mentioned in the introduction, I have started to build a Matt Layden's Paradox, scaled up 20%, to be rigged with junk rig. The photo of the planned layout is also added to photos section. The total length is about 5.1m or 16ft 8ins  http://www.junkrigassociation.org/resources/SiteAlbums/781899/preview/rig%20comparison2.jpg

    I had to move the mast a bit forward, to get to step it a bit lower, but also to avoid boom (and battens) to overhang the transom.

    The plan is that the sail will be on starboard side of the mast; and halyard (through the mast), luff hauling parrel (or throat parrel) and tack parrel lead through the deck as halyard and furling line as per plans. Sheet goes originally through transom, ideally it would also go through deck with other lines. Total sail are is 11.5m2 or 123 scft. I believe the lines will be sufficient to be 6mm or 1/4; except the sheet, to be 10-12mm or 3/8 to 1/2?

    Comments are welcome if something feels wrong.

    So far bottom is assembled and preparing for glassing...


    Cheers,

    Eerik

    Last modified: 03 Sep 2015 12:37 | Deleted user
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