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  1. #1

    Whoopie Thickness vs. Stretch

    A friend of mine rigged up his whoppie slings with 7/64 Amsteel Blue. He said that it stretched on him quite a bit. Would thicker Amsteel Blue help it not stretch as much?

    thanks
    Last edited by threeoten; 08-03-2011 at 14:29.

  2. #2
    Senior Member pgibson's Avatar
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    Amsteel has about 1% stretch at 30% of its breaking strength. Sooo If your friend weighed 420 pounds then the rope could have stretch a millimeter or two. More likely the slings were not set up correctly or the bury was no "milked" to make sure that it was gripping the line correctly.
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  3. #3
    Senior Member raiffnuke's Avatar
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    Quote Originally Posted by pgibson View Post
    Amsteel has about 1% stretch at 30% of its breaking strength. Sooo If your friend weighed 420 pounds then the rope could have stretch a millimeter or two. More likely the slings were not set up correctly or the bury was no "milked" to make sure that it was gripping the line correctly.
    That or his tree huggers streched.

  4. #4
    Senior Member TheHangingTechy's Avatar
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    Quote Originally Posted by pgibson View Post
    Amsteel has about 1% stretch at 30% of its breaking strength. Sooo If your friend weighed 420 pounds then the rope could have stretch a millimeter or two. More likely the slings were not set up correctly or the bury was no "milked" to make sure that it was gripping the line correctly.
    I second that. Amsteel stretches so little...When i first took a swing in my slings the bury had to "settle" and it dropped about 1 inch after that i make sure to milk the bury well and give it a tug to preset the bury.

    No stretch here other than the nylon hammock itself. The rope stretch at the lengths I am using and weight is so small its insignificant

  5. #5
    Is 7/64 AmBlu suitable for a whoopie hang? Or should I go with a thicker diameter?

  6. #6
    Boothill's Avatar
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    7/64" is plenty strong enough for whoopies and is what most people use, the breaking strength of 7/64 is like 1600lbs

    boot
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  7. #7
    Senior Member ganon414's Avatar
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    I would venture to guess that the majority of us hanging on Amsteel Blue whoopie slings are using 7/64". Samson reports an average strength of 7/64" at 1,600 pounds. They also claim "AmSteel® and AmSteel®-Blue Whoopie Slings have a break strength of 60% of the published average ROPE break strength." Therefore, if spliced correctly, your 7/64" whoopie sling has a strength of 1,600 lbs * 60% = 960 lbs. If hung at or near the magical 30 degree suspension angle, 7/64" should be plenty strong, even accounting for dynamic loads. However, if you are at the heavier end of the body weight spectrum, jumping up to 1/8" Amsteel Blue will give you more peace of mind.

    --Tim

  8. #8
    Senior Member pgibson's Avatar
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    I have made slings for some of the biggest hangers here, if your over 450 pounds then consider 1/8th otherwise 7/64 is more than good enough.
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  9. #9
    How long of whoopies do you all use (max length)?

  10. #10
    Senior Member Knotty's Avatar
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    Quote Originally Posted by ganon414 View Post
    I would venture to guess that the majority of us hanging on Amsteel Blue whoopie slings are using 7/64". Samson reports an average strength of 7/64" at 1,600 pounds. They also claim "AmSteel® and AmSteel®-Blue Whoopie Slings have a break strength of 60% of the published average ROPE break strength." Therefore, if spliced correctly, your 7/64" whoopie sling has a strength of 1,600 lbs * 60% = 960 lbs. If hung at or near the magical 30 degree suspension angle, 7/64" should be plenty strong, even accounting for dynamic loads. However, if you are at the heavier end of the body weight spectrum, jumping up to 1/8" Amsteel Blue will give you more peace of mind.

    --Tim
    I corresponded with Samson Rope about whoopie slings and they said that 60% was probably too conservative and testing showed it to be more like 80%.
    http://www.hammockforums.net/forum/s...18&postcount=1
    Knotty
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