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  1. #1
    Herder of Cats OutandBack's Avatar
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    Continous Ridgeline w/prussic knot Snow Load Tests

    Hi All,

    I am testing a continuous ridgeline with 1/8" amsteel.
    Tarp is attached to the ridgeline using 8" long cord/prussic knots and small toggles.

    To increase the tarps snow load I have the ridgeline under the tarp.

    Here are a few shots.
    It's been snowing for about 6 hours and there is 3" of snow on the ground.

    Snow load on the tarp is about 1.25"
    There is quite a bit of sag. I believe the prussic knots are slipping.
    After knocking all the snow off I was able to re-tension the tarp and the prussic moved about 5"

    Once the snow was cleared. All corner stakeout lines had to be re tensioned by 5-6".
    Not sure what to try next since this was the strongest setup I could think of.

    I could tie straight from tarps D ring to tree with no ridgeline however I am worried the tarp could fail.

    It's better to have a sagging tarp than torn tarp.

    Anyone have other suggestions I might try?





    Last edited by OutandBack; 01-09-2011 at 16:33.

  2. #2
    Dutch's Avatar
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    I tie right to the trees. However I also have a steeper pitch so the snow doesn't pile up.
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  3. #3
    Alamosa's Avatar
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    Adding an additional wrap when tieing your prussik or switching to a klemheist may stop the slipping along the CRL.
    We must, indeed, all hang together, or assuredly we shall all hang separately. - Ben Franklin
    (known as a win-win on this forum)

  4. #4
    2Questions's Avatar
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    IMHO,
    The best way to configure a tarp for a snow load is when it minimizes the snow load. Set up so the snow is shed off instead of adding weight to the tarp. That's where the beauty of a center pole shines.
    Last edited by 2Questions; 01-09-2011 at 16:31.
    2QZQ Hammock Specialties
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  5. #5
    bloomgorge's Avatar
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    agree with dutch and i think that treking pole is causing your tarp to act like a catch basin. i would drop your tie outs closer to the group and opt for side tie outs on the tarp.

  6. #6
    Senior Member optimator's Avatar
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    Quote Originally Posted by bloomgorge View Post
    agree with dutch and i think that treking pole is causing your tarp to act like a catch basin. i would drop your tie outs closer to the group and opt for side tie outs on the tarp.
    I agree with this. I also have always thought Amsteel is overkill for a tarp ridgeline.
    It's only an addiction if your trying to quit

  7. #7
    Herder of Cats OutandBack's Avatar
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    Thanks for the tips guys.

    I raised the ridgeline to ~7' , removed the ski pole and dropped the angle from
    ~50 degrees to ~40 degrees also shortened the 4 corner ty-out.

    It's still snowing so the testing continues...



    Alamosa- I am currently using 4 wraps on the prussic. I will give 5 a try next time I go out. I'll have to look up the klemheist.

    optimator- your hands are probably younger than mine.
    1/8" rope is the smallest diameter these old hands can deal with and really like amsteel so I don't bother with other types of rope or lashing.

    My thinking on the skipole porch.
    I was really hoping to use the pole porch.
    This was allowing me to enter/exit the hammock area without touching the tarp with my head and giving me a little more room under the tarp area to sit out the falling snow.
    I guess I could still do this when awake just not for the evening if snow is expected.

    Please keep the ideas and thoughts coming...
    Last edited by OutandBack; 01-09-2011 at 16:41.

  8. #8
    Senior Member traftonm's Avatar
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    Quote Originally Posted by optimator View Post
    I agree with this. I also have always thought Amsteel is overkill for a tarp ridgeline.
    I agreee with you Amsteel is over kill I would not want ther tarp to be the week link. better to have to repair the ridge line the the tarp.

  9. #9
    Herder of Cats OutandBack's Avatar
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    Just a couple shots of the prussic on the ridgelien.

    Ridgeline wraps around the tree to the figure9.
    Figure 9 attached to prussic for safety release/slide so nothing breaks under heavy load.


    Prussic knot on ridgeline toggled to tarp D rings.

  10. #10
    Senior Member optimator's Avatar
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    Quote Originally Posted by OutandBack View Post
    Thanks for the tips guys.


    optimator- your hands are probably younger than mine.
    1/8" rope is the smallest diameter these old hands can deal with and really like amsteel so I don't bother with other types of rope or lashing.
    If that's the case I'd go with some 1/8 poly rope. Cheaper, still no stretch, and a much lower breaking point. Still plenty strong though. I'm no youngster, but even using Speer no tangle is no problem with a figure 9.
    It's only an addiction if your trying to quit

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