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[ksurf] Re: AW: No Subject

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  • Michel Montmigny
    ... Few years ago, Professionnals from paragliders makers was talking about 60% weaker on the knot...? Michel ... Free Web-based e-mail groups --
    Message 1 of 4 , Dec 2, 1998
      srosso@... wrote:
      >
      > In a german kitemagazin was an article about some tests
      > with different lines.
      > result for traction you only need lines of 3/4 of the pilots weight, you
      > do not need lines for 200 kg.
      >
      > What about when you go UP ??? then you need the total of the lines to
      > support at LEAST your weight + there is the acceleration up.... so that
      > might double your weight ! (if you accelerate up at 1 G)
      >
      > 3/4 + 3/4 of your weight = 1.5 your weight
      > Add the board harness wetsuit - water inside your wetsuit - and you have
      > almost NO margin for error !!
      >
      > then consider when you are about to go for a jump and the wave lip crashes
      > down on you and pushes you to the bottom of the sea - then you are talking
      > about more than your weight ! maybe three times (you need a safety margin
      > !! )- if you are an 80 kg flysurfer (with board and acessories) then you
      > need 80 * 3 = 240 kg. Also the knots to connect weaken the lines - even
      > when protected i heard that by 30% (ok, i am not sure)
      >
      >
      Few years ago,

      Professionnals from paragliders makers was talking about 60% weaker on
      the knot...?

      Michel
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    • Pierce Nichols
      ... It depends on the knot, and how it s tied. Sleeving obviously helps enormously. As for the knot, a figure-8 on a bight (loop) is supposedly the strongest
      Message 2 of 4 , Dec 3, 1998
        On Wed, 2 Dec 1998, Michel Montmigny wrote:

        > Few years ago,
        >
        > Professionnals from paragliders makers was talking about 60% weaker on
        > the knot...?

        It depends on the knot, and how it's tied. Sleeving obviously
        helps enormously. As for the knot, a figure-8 on a bight (loop) is
        supposedly the strongest possible non-spliced loop. Since the standard
        knot for that purpose in kiting appears to be an overhand on a bight,
        we're pretty close as is.

        -p

        "There are four boxes that are used in the defense of liberty.
        Soap, Ballot, Jury, and Ammo. Use in that order."

        -Anon

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      • Dave Culp
        ... Don t kid yourself, however. Strongest possible only means you lose 40% of strength, as opposed to 60%, or more. Knotted lines are a waste of money,
        Message 3 of 4 , Dec 3, 1998
          > It depends on the knot, and how it's tied. Sleeving obviously
          > helps enormously. As for the knot, a figure-8 on a bight (loop) is
          > supposedly the strongest possible non-spliced loop. Since the standard
          > knot for that purpose in kiting appears to be an overhand on a bight,
          > we're pretty close as is.
          >
          Don't kid yourself, however. "Strongest possible" only means you lose
          40% of strength, as opposed to 60%, or more. Knotted lines are a waste
          of money, weight and wind resistance. In a race, a flier using lighter,
          spliced lines will *always* beat a heavier lined, knotted flyer,
          especially to windward. Believe it.

          Dave Culp
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