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  1. #1
    Senior Member Drop's Avatar
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    Hitchcraft for hammock tensioning

    Hi, I.. I mean a totally obsessed friend of mine... was searching through hammock videos on Youtube when this video came up

    basically what appears to be a simple to use pulley/tie off system

    I did a bit of leg work and have the link to the hitchcraft site
    http://www.hitchcraft.net/

    I thought it might be of interest to hangers as a possible alternative to the Hennessey whipping or the strap/rings method. I don't use a HH so have no real reason to get these I just thought somebody might find these useful.



    Two sizes available. I'm not sure what diameter rope is used on a HH but I assume its the smaller version so 250 lbf (though hammockers are looking at two points of support halving the forces?!?).


    Mini RopeTie

    weight: 0.9 oz (26 g)
    safe working load: 250 lbf (1.1 kN)
    rope diameter: .125"-.250" / 3mm-6mm
    $11.95 /pr


    Monster RopeTie

    weight: 2.9 oz (82 g)
    safe working load: 500lbf (2.2 kN)
    rope diameter: .250" - .438" / 6mm-11mm
    $17.95

    2 mini + 2 monster $27.95

    Drop
    Last edited by Drop; 05-30-2007 at 20:34.

  2. #2
    Senior Member FanaticFringer's Avatar
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    "Every day above ground is a good day"

  3. #3
    Senior Member Drop's Avatar
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    Doh, sorry, thought I new all the threads by heart now.
    feel free to lock/delete mods

  4. #4
    Senior Member FanaticFringer's Avatar
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    Dont feel bad. I did the same thing yesterday about the Tom Hennessy response.
    "Every day above ground is a good day"

  5. #5
    New Member hitchman's Avatar
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    Wink about hitchcraft

    Hi!
    I saw the threads that mention my product, the Hitchcraft RopeTie, and I would like to address some of the comments.
    This product was the result of a couple of years development. The jam cleat that makes it adjustable does not damage the rope. The edges are rounded and smooth. This type of device is commonly found in sailboats and windsurfer rope handling gear.
    Personally I have a Hennessey Hammock with a 1/4" rope. I understand there are other models with smaller spectra line. The Mini version will work with 1/8" to 1/4" line.
    Thanks to those who showed interest in my product. I'd be happy to respond personally to any questions.
    Cheers!

  6. #6
    Jazilla's Avatar
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    Hitchman, will the mini's hold the load required to keep a Hennessey hammock off the ground. We are talking forces over 6 to 7 hundred pounds or more?
    Yosemite Sam: Are you trying to make me look a fool?
    Bugs: You don't need me to make you look like a fool.
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  7. #7
    New Member hitchman's Avatar
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    Load rating

    By my calculation the load on each end rope is about the same as the person's weight. I assume an angle of 30 degrees when loaded, which by my experience requires a pretty tight rope.
    The safe load on the Mini RopeTie is 250 lbs. The breaking load is more than twice that. Given that, I would recommend the Monster for people who weigh close to 200 lbs. Backpackers will have to weigh the pros and cons of carrying 4 oz of the Monster pair versus the Mini. Alternatively, if you carry only one Monster, that will give you quick adjustment on one end, which is all you really need.
    However, if you carry some rope, it would be advisable to carry the size that also works with that rope.
    Thanks for your question.
    Miguel
    Last edited by hitchman; 05-31-2007 at 13:17.

  8. #8
    Senior Member blackbishop351's Avatar
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    Quote Originally Posted by hitchman View Post
    By my calculation the load on each end rope is about the same as the person's weight. I assume an angle of 30 degrees when loaded, which by my experience requires a pretty tight rope.
    You might want to recheck your math. Just an estimate here, but a 200-lb. person should exert around 600 lbs. of tension on a suspension, with a 30* sag angle.
    "Physics is the only true science. All else is stamp collecting." - J. J. Thompson

  9. #9
    New Member hitchman's Avatar
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    Here is my math: Sin of 30 is 0.5, meaning that for a 30 degree angle the vertical component is half of the tension on the rope. Each end carries half of the weight. So for a 200 lb weight, or any weight for that matter, the rope tension on each end is the same as the weight (multiplied by 0.5 and divided by 2).
    I agree that the conservative way to go is with the Monster, but many back packers watch their gear weight very closely.
    I weigh 180 lbs and feel quite safe with the Mini, but it is important to note that this device makes tensioning very easy, and people may be inclined to tighten the rope more than they would otherwise. With a tighter rope the angle will get smaller and the load on the rope and the hitch will increase.
    Last edited by hitchman; 05-31-2007 at 13:59.

  10. #10
    Senior Member blackbishop351's Avatar
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    Quote Originally Posted by hitchman View Post
    Here is my math: Sin of 30 is 0.5, meaning that for a 30 degree angle the vertical component is half of the tension on the rope. Each end carries half of the weight. So for a 200 lb weight, or any weight for that matter, the rope tension on each end is the same as the weight (multiplied by 0.5 and divided by 2).
    I agree that the conservative way to go is with the Monster, but many back packers watch their gear weight very closely.
    I weigh 180 lbs and feel quite safe with the Mini, but it is important to note that this device makes tensioning very easy, and people may be inclined to tighten the rope more than they would otherwise. With a tighter rope the angle will get smaller and the load on the rope and the hitch will increase.
    Yeah so apparently I automatically can't do geometry in my head after graduation...thanks!
    "Physics is the only true science. All else is stamp collecting." - J. J. Thompson

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