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Mast Rotation Control Arm for NACRA 5.8?  Bottom

  • My 1986 5.8 has a mast rotation problem. Her mast slaps around when her sails are off her and the wind picks up. I replaced the Mast Ball and this didn't help. Should I replace the Shrouds since they have probably stretched? What about adding a Mast Rotation Control bracket? I had one on my 1983 5.2, but my 5.8 is Boom-less.
    If I do add a Mast Rotation Control Arm, how should I rig it? Anybody out there have any experience with a Sloppy Mast? I know, this is kind of a personal question, but I just gotta know.
  • If it's flopping about when the sails are off then you don't have enough tension in the rig. Make sure your shrouds are tight, have a friend pull down on a trap wire while you are adjusting each side to get a nice tight rig
    But so tight the mast doesn't rotate at all.

    --
    Dave Bonin
    1981 Nacra 5.2 "Lucile"
    1986 Nacra 5.7 "Belle"
    Winnipeg, Manitoba, Canada
    --
  • Also check the tension on your diamond wires.

    --
    Dave Bonin
    1981 Nacra 5.2 "Lucile"
    1986 Nacra 5.7 "Belle"
    Winnipeg, Manitoba, Canada
    --
  • Is your 5.8 the same as the 5.7 & 5.0 boomless setups?
    They look like this;
    http://www.thebeachcats.com/gallery2/main.php?g2_view=core.DownloadItem&g2_itemId=74457&g2_serialNumber=7
    The lines are not rigged correctly, it should be an endless line, giving 2:1
    I have an extra if you are interested in setting your boat up this way.

    --
    Hobie 18 Magnum
    Dart 15
    Mystere 6.0XL Sold Was a handful solo
    Nacra 5.7
    Nacra 5.0
    Bombardier Invitation (Now officially DEAD)
    Various other Dock cluttering WaterCrap
    --
  • here's what my 5.8 setup looked like. teal colored line was used as a rotator topping lift. this arrangement won't help you induce rotation, just reduce rotation.
    j
    http://www.thebeachcats.com/gallery2/main.php?g2_view=core.DownloadItem&g2_itemId=124249&g2_serialNumber=3
    http://www.thebeachcats.com/gallery2/main.php?g2_view=core.DownloadItem&g2_itemId=124245&g2_serialNumber=3
    http://www.thebeachcats.com/gallery2/main.php?g2_view=core.DownloadItem&g2_itemId=124253&g2_serialNumber=3



    Edited by arch on Aug 05, 2016 - 02:52 AM.

    --
    Aquacat 12 (sold)...'87 Nacra 5.8 (sold)...'03 Nacra Inter18 (sold)
    Venture 15 (sold)....'89 Nacra 5.8 (sold)...'91 Nacra 5.8NA (sold)
    '99 Nacra Inter20 (sold)
    --
  • I don't have firsthand experience with the 5.8. I thought all the boomless models faced the wishbone forward?

    --
    Hobie 18 Magnum
    Dart 15
    Mystere 6.0XL Sold Was a handful solo
    Nacra 5.7
    Nacra 5.0
    Bombardier Invitation (Now officially DEAD)
    Various other Dock cluttering WaterCrap
    --
  • Here's a picture with the arm pointing forward. This arrangement enables over-rotation of the mast (>90 degrees) when on a broad reach. Also shown is rigging for a 2:1 control line. The block at the trampoline is secured by a short pigtail with a stopper knot below.

    http://www.thebeachcats.com/pictures?g2_itemId=123614

    --
    Kip
    NACRA 5.8na
    Chesapeake, VA
    --
  • I can't open the link...
    Did you right click the image, select "copy image location". Then click the "image" button,(just below where you are typing), then paste your link.

    --
    Hobie 18 Magnum
    Dart 15
    Mystere 6.0XL Sold Was a handful solo
    Nacra 5.7
    Nacra 5.0
    Bombardier Invitation (Now officially DEAD)
    Various other Dock cluttering WaterCrap
    --
  • Here's the image. (I posted originally using my tablet and did not find a "copy image address" option.)

    One thing I forgot to mention is that the working end of the control line is secured in a clam cleat attached to the front beam. You can see a portion of the starboard cleat at the right edge of the photo.

    http://www.thebeachcats.com/gallery2/main.php?g2_view=core.DownloadItem&g2_itemId=123618&g2_serialNumber=3

    --
    Kip
    NACRA 5.8na
    Chesapeake, VA
    --

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