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  1. #21
    Senior Member DemostiX's Avatar
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    Quote Originally Posted by Knotty View Post
    You'll find your answers here.
    Terrific.

    Thanks Ron, and I know where to go for statements on testing and specifications more recent than those contained in some research papers.

    Not to mention that
    • 40% derating is estimated by Samson to be high 20% derating is a better estimate from testing
    • the unavoidable stress riser /discontinuity is indeed the point of failure, and
    • by implication, the reduction of stress riser by tapering the bury -- not possible with the whoopie as it is with the fixed eye-- is important to increasing strength of a buried splice.


    So, it is valuable to check and respect the research rather than a vendor's authority; remember what the research and field finding are; and draw inferences about the the mechanism which are consistent with and informed by behavior of other materials under stress.

    It would have been appropriate if everyone who participated in the cited thread had remembered what was explained and understood there. There would then not have been in another recent thread a dispute about the value of the tapering the bury in the splice. The taper is not primarily so it is easier to push or pull the bury. Tapering in the prescribed manner is optional only if you wish to permit the cord to break with a lower load. That wouldn't seem smart when loads of assembled cords reduce margins of working to maximum load to well below 12, 10, or even 5 to one ratios.
    Last edited by DemostiX; 08-05-2011 at 03:29.

  2. #22
    Senior Member Jsaults's Avatar
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    Everyone seems to be focussed on suspension

    stretch, but don't lose sight of the fact that virtually all of us are using NYLON hammcocks. Gotta be a source of at least a bit of stretch. Or am I just ranting into the wind?

    Jim

  3. #23
    Senior Member Knotty's Avatar
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    Quote Originally Posted by DemostiX View Post
    ....The taper is not primarily so it is easier to push or pull the bury. Tapering in the prescribed manner is optional only if you wish to permit the cord to break with a lower load. That wouldn't seem smart when loads of assembled cords reduce margins of working to maximum load to well below 12, 10, or even 5 to one ratios.
    Spot on. The taper exists to avoid load concentration in the rope which weakens it. Making it easier to do the bury is just a side benefit.

    Quote Originally Posted by Jsaults View Post
    stretch, but don't lose sight of the fact that virtually all of us are using NYLON hammcocks. Gotta be a source of at least a bit of stretch. Or am I just ranting into the wind?

    Jim
    I think that's correct Jim. Also, trees flex, tree huggers cinch down and even though amsteel fibers don't really stretch, the adjustable section is like a Chinese finger trap so that section does lengthen some under load as it squeezes the bury and the whole rope is a braid that reduces in diameter and lengthens as load is applied. It's probably more accurate to describe Amsteel as a rope that doesn't stretch once loaded. In other words, the length effectively stays the same once loaded all the way up to the breaking point.

    In general, I find that to end up with a 30 degree from horizontal suspension angle, when I'm in the hammock, I have to string it up with a much shallower angle for the empty hammock.
    Knotty
    "Don't speak unless it improves the silence." -proverb
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  4. #24
    Senior Member rip waverly's Avatar
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    my slings are now 4ft. -down from 6ft.

    i'm too short to attach high enough on a tree for a hang distance that would
    require anything longer than 4 foot whoopies.
    "Jeff-Becking"

    DOWNTOWN BROWN!!!!

  5. #25
    Senior Member DemostiX's Avatar
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    Quote Originally Posted by rip waverly View Post
    my slings are now 4ft. -down from 6ft.

    i'm too short to attach high enough on a tree for a hang distance that would
    require anything longer than 4 foot whoopies.
    Without doubt the welfare of at least 5% of HF members, including the two of us, would be improved with a <20 gram invention to securely link tarp pegs to each other or to hiking poles to become short step ladders or stilts, just so we can string lines and attach tarps higher up on the tree.

    Or: Fresh suggestions from tree climbers on how to attach and detach straps and lines well over our heads?

  6. #26
    Senior Member rip waverly's Avatar
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    Quote Originally Posted by DemostiX View Post
    Without doubt the welfare of at least 5% of HF members, including the two of us, would be improved with a <20 gram invention to securely link tarp pegs to each other or to hiking poles to become short step ladders or stilts, just so we can string lines and attach tarps higher up on the tree.

    Or: Fresh suggestions from tree climbers on how to attach and detach straps and lines well over our heads?
    i've used tree stumps to boost me up a tree
    but this looks more efficient


    sorry for the thread drift--- but seriously- with 6 ft straps and a dynaglide packleash/extender.... even paul's 3 foots are acceptable imho.
    "Jeff-Becking"

    DOWNTOWN BROWN!!!!

  7. #27
    Senior Member hppyfngy's Avatar
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    Quote Originally Posted by rip waverly View Post

    .


    Thanks for that. I haven't actually lolled in a while...
    Some say I'm apathetic, but I don't care. - Randy

  8. #28
    Phantom Grappler's Avatar
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    Make sure to milk bury

    Make sure bury is constructed long enough

    It is possible your hammock stretched a bit

    After set up tie a slip knot in amsteel on loose end, one inch from bury exit. Slip knots are directional, tie so that would come undone if you pulled loose end or part not taut, bearing no weight. This slip knot WILL NOT Slip. If amsteel slips in whoopie sling or UCR; it will slip only that one inch and then will be too big to get pulled into bury. My guess is—-it will hold until morning.

    Good luck


    Sent from my iPhone using Tapatalk

  9. #29
    Phantom Grappler's Avatar
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    Quote Originally Posted by DemostiX View Post
    Without doubt the welfare of at least 5% of HF members, including the two of us, would be improved with a <20 gram invention to securely link tarp pegs to each other or to hiking poles to become short step ladders or stilts, just so we can string lines and attach tarps higher up on the tree.

    Or: Fresh suggestions from tree climbers on how to attach and detach straps and lines well over our heads?
    I’ve used a forked stick, or a stick with a branch extending sideways from main stick. And used stick to lift tree strap higher up tree than I can get just reaching.
    Or maybe you can balance on a cut log of firewood, or get someone with an acrobatic circus background to boost up high.

    Phantom skeeeerd of heights


    Sent from my iPhone using Tapatalk

  10. #30
    Senior Member
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    I use a hiking pole when I have a long hang - usually pretty stretchy.

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