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Old 27-05-2013, 15:23   #1
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Dyneema line fails, causes NASCAR damage

I wonder what happened here? Dyneema line fails, camera falls, cars and fans hurt.
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Old 27-05-2013, 15:30   #2
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Re: Dyneema line fails, causes NASCAR damage

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Originally Posted by Kettlewell View Post
I wonder what happened here? Dyneema line fails, camera falls, cars and fans hurt.

Dyneema (and its sisters and its cousins and its aunts) is more subject to failure from friction. You can cut it (not well of course) by running it across a sharp edge. If a guide oo for instance, a pully/block -- failed and the dyneema was being dragged across a metallic edge it could fail pretty easily.
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Old 27-05-2013, 15:41   #3
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Re: Dyneema line fails, causes NASCAR damage

bet it failed at a termination. or.......chafe somewhere.
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Old 27-05-2013, 15:47   #4
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Re: Dyneema line fails, causes NASCAR damage

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bet it failed at a termination. or.......chafe somewhere.

Thank you. That's the word I was looking for -- chafe! It will be easy to spot if that was the cause.
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Old 27-05-2013, 16:11   #5
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Just as a bit of perspective, you won't find much steel wire rope used anymore for stunt work or high speed winch work in TV or film, in the uk it's mostly tech12 as it doesn't mind high temperature so much. Suspect that line might not have been dyneema. From here it looks possibly a winch/software failure but who knows.
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Old 27-05-2013, 16:14   #6
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Re: Dyneema line fails, causes NASCAR damage

I watched that race, looked like double braid to me........ Michael...
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Old 27-05-2013, 16:29   #7
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Re: Dyneema line fails, causes NASCAR damage

Fox said it was Dyneema:

Quote:
In a statement released Monday, Fox Sports said the rope is made of Dyneema, a synthetic that has the same approximate strength of a steel wire with the same diameter.

The rope was less than a year old and was certified to have a breaking strength of more than 9,300 pounds. The force used for the “CAMCAT” camera is less than 900 pounds, according to Fox.

“Fox Sports is reviewing with CAMCAT equipment maintenance records, history and installation information and will share those findings with NASCAR and CMS,” Fox Sports said in a statement.
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Old 27-05-2013, 16:38   #8
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Re: Dyneema line fails, causes NASCAR damage

oh, if Fox says it, it MUST be accurate...
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Old 27-05-2013, 18:43   #9
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Re: Dyneema line fails, causes NASCAR damage

Anything to dispel a claim by stating only the best was used, but in reality probably was cloths line from home hardware.
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Old 27-05-2013, 18:50   #10
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Re: Dyneema line fails, causes NASCAR damage

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Originally Posted by tamicatana View Post
oh, if Fox says it, it MUST be accurate...
Ack! Kettlewell tricked us into clicking on a Fox News link! We're poisoned!


I'm meeeelting.......
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Old 27-05-2013, 18:52   #11
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Re: Dyneema line fails, causes NASCAR damage

I'll just keeping using three stand for my snubbers, you guys let me know how all this stuff shakes out over the years.
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Old 27-05-2013, 19:26   #12
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Re: Dyneema line fails, causes NASCAR damage

Quote:
Originally Posted by Kettlewell View Post
Fox said it was Dyneema:
1/4" Amsteel / Dyneema has a tensile strength of 8,600 lbs
5/16" is 13,700 lbs

Maybe they should have put a snubber on the cam so the line would not snap

If they where reading the CF, things like this would never happen.
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Old 27-05-2013, 23:48   #13
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Originally Posted by Cotemar View Post

1/4" Amsteel / Dyneema has a tensile strength of 8,600 lbs
5/16" is 13,700 lbs

Maybe they should have put a snubber on the cam so the line would not snap

If they where reading the CF, things like this would never happen.
A quick Google says the company was one I think I've seen onsite at a horse racing event, they used what looked like 11mm abseil dyneema for a 500m tracking shot between 2 cranes. Not the same sk75 we know. But if it was you'd really have to be going some to break a piece of that!
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Old 28-05-2013, 04:18   #14
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Re: Dyneema line fails, causes NASCAR damage

I was on another boat recently and he was showing me his dyneema.
I didnt mention it to him as he is quite a house proud type of guy but his splice was a casing splice.. ie the dyneema core was not joined, just the otter casing. And that's got bugger all SWL.

So I wonder if the Fox set up was properly set up? No use blaming the rope if its not fixed right!



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Old 28-05-2013, 04:26   #15
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Re: Dyneema line fails, causes NASCAR damage

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So I wonder if the Fox set up was properly set up? No use blaming the rope if its not fixed right!k

99.9% not the rope. Someone did something wrong or a hardware failure. Surprising the age of the rope, in film/tv applications for critical stuff it only ever gets used once.
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