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Test vids: slings and wires
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boku


Mar 31, 2008, 5:45 PM
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Registered: Jun 11, 2004
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Test vids: slings and wires
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With apologies to Skinner who asked me to do these tests many months ago, and supplied the test articles, here's videos of three tests of the breaking strength of nylon slings and steel cable:

30 March 2008, test 1: Strength test of 22 kN nylon climbing sling girth hitched to 1/8" steel cable on BD #5 stopper. Sling breaks at about 1200 lbs force (5.33 kN).

http://www.youtube.com/watch?v=XdOGvkd1VMg

30 March 2008, test 2: Strength test of 22 kN nylon sling hitched to 1/8" steel cable with a "climer hitch." The nylon sling breaks at around 1400 lbs force (6.2 kN).

http://www.youtube.com/watch?v=wxuEfm8QyPI

30 March 2008, test 3: Strength test of two BD #5 stoppers with 1/8" cable girth hitched together. One cable breaks at 1450 lbs force (6.4 kN).

http://www.youtube.com/watch?v=9p9f5nyQYgs

Some notes on these tests:

I did the tests involving nylon on my hand-cranked vertical stick hoist because my hydraulic puller doesn't have the range for a very long piece of nylon. Nylon stretches so much that, unless the article is pretty short, my hydraulic ram often bottoms out before encountering article failure.

The big delay between these tests and prior tests was caused by trouble trying to come up with a better calibration chart for my earlier hydraulic force measuring system. In the end I threw in the towel and just bought a 10,000 lbf load cell.

Last week I also tested a bunch of cams (mostly Aliens) to about half rating, but that was boring since nothing popped.

Next weekend at the shop I'll re-run the tests on the two nylon-to-steel configurations and see if the results are similar.

I don't visit these forums too much lately (too busy), but you can reach me at:

bob at hpaircraft dot com

Thanks, Bob "BoKu" K.


(This post was edited by boku on Mar 31, 2008, 5:48 PM)


ja1484


Mar 31, 2008, 6:15 PM
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Re: [boku] Test vids: slings and wires [In reply to]
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Awesome. Nice to see how the gear reacts under these unusual "emergency" type circumstances.


adatesman


Mar 31, 2008, 6:58 PM
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linvillelover


Apr 4, 2008, 4:57 PM
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Re: [adatesman] Test vids: slings and wires [In reply to]
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very interesting with the two stoppers girth hitched.

i wont ever hesitate to use that if i need to.


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