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  1. #21
    Senior Member nacra533's Avatar
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    Quote Originally Posted by Knotty View Post
    From my original post on this. http://www.hammockforums.net/forum/s...ad.php?t=12319

    It doesn't totally agree with opie's testing but the bottom line is changing from locked brummel to standard buried eye splice doesn't change anything in a whoopie sling because it's not the normal point of failure.

    *********
    I wrote to Samson Ropes about Amsteel whoopie slings asking where they would fail. Here is their response.


    Using Amsteel Blue whoopie slings for suspending hammocks is a very interesting application. Thanks for the link to the thread on the hammock forum, it's a good discussion.

    Recently the reduction to 60% of average break strength for Amsteel Blue whoopie slings was suspected to be a low value. Testing showed that it is actually around 80% depending on the size of the rope. On every test done the break location was at the point of the adjustable whoopie tail exit.

    Samson: The Strongest Name in Rope

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    The "new" derating seems more reasonable.

    Just a reminder, a locked brummell is put in to reduce the likelyhood of the splice slipping in a no or low load condition. It is not as strong as a properly done straight bury splice, although the name and appearance indicate otherwise. A properly done straight bury can be (in many tests) a couple percent stronger than the line itself, depending on the type of line. The failure location is almost always where the splice ends and a poor taper guarantees this spot, which Samson agrees with.

    All this to say, I primarily use locked brummels on my boats and camping gear and this is a great application. Many people are using smaller and smaller line and many are splicing novices, which is great. It's a good skill to have. This is just a friendly reminder to pay attention to your application and use proper techniques for the specific line you are working with.

  2. #22
    Senior Member ikemouser's Avatar
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    Is it ok to never have ran you rline through itself over and over as in the pic above, i just made my loop, and sewed the bury, i didnt make those passes as seen in your pictoral in picture 2. Slept in my hammock for weeks, nothing happened. chime in opie, need a pro opinion!

  3. #23
    Senior Member opie's Avatar
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    Quote Originally Posted by Knotty View Post
    From my original post on this. http://www.hammockforums.net/forum/s...ad.php?t=12319

    It doesn't totally agree with opie's testing but the bottom line is changing from locked brummel to standard buried eye splice doesn't change anything in a whoopie sling because it's not the normal point of failure.

    *********
    I wrote to Samson Ropes about Amsteel whoopie slings asking where they would fail. Here is their response.


    Using Amsteel Blue whoopie slings for suspending hammocks is a very interesting application. Thanks for the link to the thread on the hammock forum, it's a good discussion.

    Recently the reduction to 60% of average break strength for Amsteel Blue whoopie slings was suspected to be a low value. Testing showed that it is actually around 80% depending on the size of the rope. On every test done the break location was at the point of the adjustable whoopie tail exit.

    In collusion, the locking brummel has less impact on break strength reduction than the "sudden transition in size where the adjustable section exits the bury". If a traditional buried eye replaced the brummel, the same strength reduction would be expected because the adjustable bury exit is the weakest link.


    Best regards,

    Mark Pederson
    R&D Engineer


    Samson: The Strongest Name in Rope

    www.samsonrope.com
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    Knotty, Later testing supports the finding that the whoopie sling does indeed fail at the exit of the adjustable bury.
    I am not a gram weenie. , But Im starting to see the merits!!!

    Kris' Splicing

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  4. #24
    Senior Member opie's Avatar
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    Quote Originally Posted by ikemouser View Post
    Is it ok to never have ran you rline through itself over and over as in the pic above, i just made my loop, and sewed the bury, i didnt make those passes as seen in your pictoral in picture 2. Slept in my hammock for weeks, nothing happened. chime in opie, need a pro opinion!
    You are correct.

    I do it so that it gives me a "backer" to pull the tails tight against prior to burying.
    I am not a gram weenie. , But Im starting to see the merits!!!

    Kris' Splicing

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  5. #25
    Knotty's Avatar
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    Quote Originally Posted by ikemouser View Post
    Is it ok to never have ran you rline through itself over and over as in the pic above, i just made my loop, and sewed the bury, i didnt make those passes as seen in your pictoral in picture 2. Slept in my hammock for weeks, nothing happened. chime in opie, need a pro opinion!
    Sounds like a standard eye splice which is the strongest way of making an eye.
    Knotty
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  6. #26
    Senior Member JohnSawyer's Avatar
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    One thing nobody mentions here: We typically talk about the breaking strength of these lines, not the "Safe working load." There are a lot of factors that can derate a line over time: Abrasion, UV exposure, overloading, etc.

    Manufacturers publish working load values for safety (and liability) reasons. If we're seeing whoopie sling failures, were these New or old/worn slings?

    Makes me want to hang over a soft spot...

  7. #27
    Senior Member HamMike's Avatar
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    sewing a bury

    what are you guys using to sew your bury. I used the inerds of some parachord on my first set then wrapped over the sewn area with a long piece of the same just because i wanted to dress it up. I started at the base of my loop and ran about four stitches a quarter inch apart and turned the sling 90 degrees and returned to the base of the loop. Does anyone have a suggesstion on a technique for finishing up the stitch?
    "He who makes a beast of himself, gets rid of the pain of being a man." Dr. Hunter S. Thompson

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  8. #28
    New Member GiantDave's Avatar
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    HamMike -- heres something from New England ropes -- http://www.neropes.com/SPL_KernHiVee.aspx

    It explaines how to stitch the thoat of the spice. Hope this helps.

  9. #29
    New Member GiantDave's Avatar
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    Ok--I started this and have to ask--Has anyone had a failure of either type of splice? Besides destructive testing, I mean. This is all getting a bit confusing again.

  10. #30
    Senior Member opie's Avatar
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    Quote Originally Posted by GiantDave View Post
    Ok--I started this and have to ask--Has anyone had a failure of either type of splice? Besides destructive testing, I mean. This is all getting a bit confusing again.
    Not that Im aware of.

    And Im sure we'd hear about it if there was.
    I am not a gram weenie. , But Im starting to see the merits!!!

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