Mandalay Bay video wall fall

Van

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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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Van

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BillConnerFASTC

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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.
 

egilson1

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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.

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
 

MNicolai

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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.
 

Van

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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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JohnD

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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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MNicolai

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To add to the "OH Fudge" factor I wonder if this was on the IN or the OUT?
Out. There are photos flying around Facebook showing it in use during the show.
 
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Van

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egilson1

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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.
 

Van

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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.
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."
 

venuetech

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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.
 
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Michael K

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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.

"Videowall doesn't weigh anything"...
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.)