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Mandalay Bay video wall fall

Discussion in 'News' started by jayvee, May 10, 2019.

  1. jayvee

    jayvee Active Member

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  2. Van

    Van CBMod CB Mods Premium Member

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    Somebody said, "motor got stuck going down" I don't think that kind of smashed up gear comes from a slow motion fall. Something failed. Wish I could see a shot of up top.
     
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  3. BillConnerFASTC

    BillConnerFASTC Well-Known Member

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    Just one more incident to support my refusal to recommend or specify chain motors. Thanks for posting.
     
  4. Van

    Van CBMod CB Mods Premium Member

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    A properly sized and maintained chain motor is a perfectly acceptable piece of equipment.

    How would you suggest rigging truss in an arena?
     
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  5. BillConnerFASTC

    BillConnerFASTC Well-Known Member

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    It can be done safely. Just too many times it hasn't been for me. Think of all the safe MAX 737 flights.

    I haven't worked on the problem, but I am sure there are safer solutions that fail less, and I'm sure they cost more, probably a lot more.
     
  6. egilson1

    egilson1 Well-Known Member Premium Member

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    Hoist mechanical failure is VERY rare. VERY VERY rare. A large percent of failures attributed to hoist failure are due to operator misuse.

    I've heard a few "on site" versions on what happen in this particular collapse. I am waiting to get more actual data.

    Ethan
     
  7. MNicolai

    MNicolai Well-Known Member Fight Leukemia

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    Like @egilson1, I've heard a variety of stories. One guy said they went on break for lunch and found it like that when they came back. Another said motor got latched into going down which I don't believe could've caused that damage and there's no reason someone couldn't have hit an e-stop, and another mentioned that the wrong wire rope diameter was used for safeties and it snapped -- also seems like a pretty extraordinary failure mechanism.

    I wouldn't believe anything in the rumor mill right now.
     
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  8. Van

    Van CBMod CB Mods Premium Member

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    Yeah, I head under sized motors, but there are a lot of picks on that truss. Seems odd that all would fail at the same time. Maybe the SR failed first and it was a cascading overload...? IDK.
     
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  9. JohnD

    JohnD Well-Known Member Fight Leukemia

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    To add to the "OH Fudge" factor I wonder if this was on the IN or the OUT?
     
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  10. MNicolai

    MNicolai Well-Known Member Fight Leukemia

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    Out. There are photos flying around Facebook showing it in use during the show.
     
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  11. MNicolai

    MNicolai Well-Known Member Fight Leukemia

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    Some photos floating around.


    [​IMG]

    (from someone on FB, all names redacted by me)

    upload_2019-5-10_16-35-20.png



    [​IMG]

    [​IMG]

    [​IMG]



    [​IMG]
     
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  12. Van

    Van CBMod CB Mods Premium Member

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    the gripple safety seems to have failed...
     
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  13. MNicolai

    MNicolai Well-Known Member Fight Leukemia

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    @Van, the question being if it was a cause or an effect.
     
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  14. egilson1

    egilson1 Well-Known Member Premium Member

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    Not necessarily. In my destructive testing of gliders/verlocks it’s not the hardware that fails but the wire rope breaks just adjacent to the fitting. And so far always above minimum breaking strength. I would want to see the hardware to determine if it was the fitting that failed or the was it the wire rope.

    Ethan
     
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  15. Footer

    Footer Senior Team Senior Team Premium Member

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    Its also weird that it came down flat like that. I'm suprised it didn't buckle more.

    Its also amazing to me how many people are carrying video walls out there that have no idea how to rig or the dynamic forces walls can exert. I had a show come in a year or two ago that wanted to hang a wall on house pipe.... dumb.... add to that we are double purchase. Promoter got to pay for local truss and motor for that day.
     
  16. Van

    Van CBMod CB Mods Premium Member

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    Currently working on a school. "Yes, I absolutely need your AV subs submittal. I need to know how much their video wall weighs so I can order counterweight for it
    ..oh and make sure the truss will carry it."
     
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  17. microstar

    microstar Well-Known Member

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    "Slightly used video wall panels available; a few dead pixels"
     
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  18. venuetech

    venuetech Well-Known Member

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    A poster (zub93) on The reddit page is saying ....

    “This wall was hung on a triangular truss, The LED panels were mounted directly to a pipe, which was in turn boroughed to the triangular truss, as pictured. The triangular truss was then "deadhung" from the box truss, by 5 1-Ton Motors, not 3 as people have been saying. (still hanging at close to trim height in the picture) However, i say "deadhung" as the triangular truss was hung using Jumbo Verlocks, not spansets. Couldn't have been more than 8-10 on the whole wall if my memory is correct. Motor failure caused a shock-load when the truss was bumped, Verlocks failed, the rest is evident.” Zub93

    Mike’s photos show the box truss in place with its 5 hoists. And what looks to be a jumbo verlock with cable at the slack end and no cable on the load side of the device.
     
    Last edited: May 11, 2019
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  19. Jay Ashworth

    Jay Ashworth Well-Known Member

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    "Videowall doesn't weigh anything"...
     
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  20. Michael K

    Michael K Active Member

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    I've had arena rigging on my mind lately, will definitely be looking out for the final conclusions drawn from this.

    My arms beg to differ after hanging any significant number of aluminum framed double panels (biggest so far is to 8 m x 4 m/~26 ft x 13 ft, did that one solo, yay arm day!) (Side note, an alum. framed 8x4m wall weighs just over an imperial ton/under a metric ton.)
     
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