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  1. #1
    Senior Member Knotty's Avatar
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    Exclamation Samson Ropes Provides Whoopie Sling Info

    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
    Knotty
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  2. #2
    Senior Member Albert Skye's Avatar
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    Good work, thanks!

    Please convince them to do some D:d testing (because that data is fundamentally useful); ideally, a plot like this. When I requested that data they said they didn't have it, but perhaps you can talk them into doing it.

  3. #3
    Senior Member gargoyle's Avatar
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    thanks knotty good info.
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  4. #4
    Senior Member
    Formerly 'TroutEhCuss'
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    I have no idea what he said.

  5. #5
    Senior Member opie's Avatar
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    Thanks Knotty.

  6. #6
    Senior Member TeeDee's Avatar
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    Knotty - thanks for the information. Now we have some actual testers information.
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  7. #7
    Senior Member Rat's Avatar
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    Quote Originally Posted by Knotty View Post
    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. Best regards,

    Mark Pederson
    R&D Engineer


    Samson: The Strongest Name in Rope
    www.samsonrope.com
    So, basically, the point of failure of Amsteel Blue when used in Whoopie Sling configuration is 80% of it average breaking strength; or, a 20% reduction in the average breaking strength.

    So at 1,600 pounds Average breaking strength (for 7/64 diameter rope), the Whoopie factor makes this 1,280 pounds; or, using the Minimum strength of 1,400 pounds the Whoopie factor makes this 1,120 pounds.

    That's the extent of my math!
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  8. #8
    Senior Member oldgringo's Avatar
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    Quote Originally Posted by Hogn8r View Post

    That's the extent of my math!
    I'm sure Gage can help you out.
    Dave

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  9. #9
    Senior Member Knotty's Avatar
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    Quote Originally Posted by TroutEhCuss View Post
    I have no idea what he said.
    Bottom line is that a whoopie will break where the adjustable tail exits the bury.


    I guess we don't need the question mark anymore.
    Knotty
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  10. #10
    Senior Member sclittlefield's Avatar
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    Thanks so much for forwarding the email along Knotty! I think I can live with 80% of the original strength.
    DIY Gear Supply - Your source for DIY outdoor gear.

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