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  1. #1
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    Mammut Moses Carabiner Failure

    while removing my hiking hammock from the trees yesterday I noticed that the spine of the carabiner had bent outward, making it impossible to close the gate.



    This pic of both carabiners for comparison:


  2. #2
    Boothill's Avatar
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    wonder if there was something faulty with the carabiner, those are rated higher than what alot of people on here use....maybe you had the hammock strung really tight and it put some extra force on the carabiner? but still it's rated at about 5100lbs so even that shouldn't of done that

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  3. #3
    Senior Member ibgary's Avatar
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    It looks like the gate was open when it bent. I've never seen that before, nothing even close.

  4. #4
    Senior Member webhanger's Avatar
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    Looks like carabiner retirement for that one.

  5. #5
    Senior Member gakayaker's Avatar
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    photos/details need to be sent to mammut
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  6. #6
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    Major Axis 22kn =4950lbs
    Minor Axis 9kn
    Gate Open Strength 8kn =1800lbs


    If the gate was open or you were putting side load on the biner,
    your losing almost 2/3rds of its strength.

    There's a lot of tension running through your suspension ropes, especially if your a big lad & they're pulled really tight.

    Or it could be just a bad biner.
    It wasn't a cheap asian copies was it ? ....just joking.

    Just checked my hammock set up in the garage, with mini biners ....the wide tree huggers on both ends had slipped under the gate,
    holding them slightly open.
    Bouncing up & down with the gate open, did nothing,
    no flex in the biner. Safe as houses......
    Last edited by ofuros; 10-01-2012 at 00:45.
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  7. #7
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    My opinion, bad biner. Aluminum should have a fairly large elastic range, and so it should return to shape. Mammut may want that one for testing. otherwise, de-rate it with a file or saw, and use it as a keyring.

  8. #8
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    More pics from different angles and my attempt to trace the two biners for comparison:




    [IMG][/IMG]


    [IMG][/IMG]

  9. #9
    MDSH's Avatar
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    There is never any more stress on a hammock suspension than what a man can put on it under live load conditions, regardless of how tight it is strung.

    Aluminum does not have very good elastic qualities but will crystal out rather easily compared to other metals. In another thread are pictures of a Ditch clip that broke.

    Airplanes are constantly inspected for stress fractures. It's the nature of the aluminum beast.

    That was a bad casting and Mammut should replace it, or prove you took a crow bar to it!

    Mike

  10. #10
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    Quote Originally Posted by MDSH View Post
    There is never any more stress on a hammock suspension than what a man can put on it under live load conditions, regardless of how tight it is strung...
    That may be, but if the hammock is strung tight and a person flops down into it applying a dynamic load, you might be surprised at the forces that can be generated. Use your cursor to move the weight up and down in this illustration of forces.

    With that said, I think the most likely scenario is that the strap held the gate open (as previously theorized).

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