Is it safe to climb SRT on the Zig Zag with a rope wrench?

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Is it safe to use the Petzl Zig Zag in an SRT setup with the Rope Wrench? What is the breaking strength of the Petzl Zig Zag and the Zag Wrench Tether? What forces are exerted on a rope and climber in different kinds of tree climbing accidents? How much force can the human body withstand? Watch this video and hopefully the tests and analyses shown here will help you make your own decisions.
Thanks to Kevin Bingham (www.singingtreedetroit.com) for providing the Rope Wrench used in the pull tests and to Richard Mumford (climbinginnovations.com) for performing the pull tests.
Results of the 7 stress tests shown in this video:
1. Zag Wrench Tether setup (SRT) on Blue Moon rope. ZZ slipped at 1237 pounds
2. Zig Zag in pure SRT setup on Blue Moon. ZZ slipped at 604 pounds
3. Zag Wrench Tether (SRT) setup on Marlow Vega rope. ZZ slipped at 1349 pounds
4. Zig Zag in standard DRT setup on Marlow Vega. ZZ skipped at 1496
5. Zag Wrench Tether (SRT) setup on Marlow Vega rope with alpine butterfly stopper knot. Rope broke at 4995 pounds
6. Zig Zag in standard DRT setup on Blue Moon with alpine butterfly stopper knot. Zig Zag broke apart at 4663 pounds
7. Straight pull test of the Zag Wrench Tether. Tether broke at 5505 pounds
Credits, References, and More information:
1. You can download the Zag Wrench Tether design file or find information on how to buy a Zag Wrench Tether at: www.tree-minded.com/p/tether....
2. The original video showing the Zag Wrench Tether is at: • Zag Wrench Tether
3. More on fall factor from Wikipedia: en.wikipedia.org/wiki/Fall_fa...
4. Richard Goldstone’s paper on deriving and explaining the impact force equation. Contact me for a copy or download the paper for free at: www.rockclimbing.com/cgi-bin/f...
5. Blue moon rope modulus: www.yalecordage.com/custom-and...
6. 67 page paper titled Survivable Impact Forces on Human Body by Harry Crawford. Contact me for a copy of download the paper for free at: www.hse.gov.uk/research/hsl_pd...
7. Pendulum equation derivation: • Horizontal Pendulum & ...
8. More on John Stapp • John Paul Stapp and So...
9. Another video about John Stapp: • MANNED ROCKET SLED RUN
10. Petzl ZigZag certification explanation: www.petzl.com/US/en/Professio...
11. Changes made between the 2013 and 2014 ZZ as a result of the recall: www.petzl.com/security/profes...
12. Johnny Pro's crane swing video: • Crane Swing
13. Results of side impact testing on the Zig Zag: www.petzl.com/US/en/Professio...

Опубликовано:

10 окт 2018

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Комментарии : 183

@TreeCutterDoug 5 лет назад

Damn bro... You scienced the shit out of it.

@Zebracat5 14 дней назад

This is the most detailed test,and analysis on the Rope Wrench and Petzl Zigzag. Glad I bought a Zigzag. Deeply Appreciated. Your a Mathematician,and Arborist.

@remingtonsawdust8046 5 лет назад

This...is...gold!!! I can't be the only one who's been waiting to hear this stuff. Excellent presentation!

@gschgvt2956 5 лет назад

A HUGE thank you to you, Mumford, and Bingham for collaborating on this. I, like many others, have been waiting for something official like this for quite some time. I now feel even safer on my ZZ in either setup knowing it’ll most likely slip and not fail catastrophically as long as my TIP doesn’t break.

@victoriousvictor7978 5 лет назад

This is awesome. Thanks a billion for this video buddy. This almost fully convinces me to get a zag now.

@WestonDeutschlander 5 лет назад

Absolutely incredible, thank you so much for taking the time and effort to do all those tests, calculations and research. Bravo!

@phillipdolliverjr.8656 5 лет назад

This was an awesome video, thank you for putting all the time and products into it. I was stuck to it and watched the entire video start to finish.

@skclimb 5 лет назад

Thank you Patrick for being so thorough and covering all of these scenarios. Great video!

@willriseley 5 лет назад

Thanks guys for making that. Really put my mind at ease and great explanations of fall factors

@joshmullinnex5113 5 лет назад

I love the zig zag and have been hesitant to use SRS. Thanks for the detailed info!

@Atimonster 5 лет назад

it's really amazing the amount of work you have put in to this.

@Brian-Outdoors 4 года назад

This is a great video that I am sure required a great amount of your time to make. Thank you so much!

@Joesdifferent 5 лет назад

Every time I recommend your product my recommendation always comes from the exact thing you have just explained in this video.

@tomplucknette5941 5 лет назад

Thank you for all of your research regarding these products as they pertain to SRT!

@jolkraeremeark6949 5 лет назад

Great content, thanks for all you've done! I have not tried my zz yet, but will try double rope first and move on from there.

@chrisgodinez2568

Wow. That was very informative and puts to rest some of my concerns with the Petzl zigzag. Thank you.

@jonboy215 5 лет назад

Anyone can tell that lots of time, brain power, and effort went into the making of this video. Phenomenal job!!!

@psidvicious 4 года назад

Very comprehensive testing. Nice work!

@dmanstasiu 5 лет назад

Wow. Thank you for the amazing research, for your time preparing this video and for sacrificing beautiful gear in the name of science. I’m sharing your results with my colleagues hoping to stir some discussion.