Technical Rescue Friction Hitches - Rope Rescue Fundamentals
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- Опубликовано: 26 сен 2024
- This rescue fundamentals series dives deep into basic technical rope rescue concepts to prepare for or supplement practical hands-on rope rescue technician training.
Here are some relevant links, citations, and additional reading:
The VAST body of research on friction hitches for rescue:
sarrr.weebly.co...
A comprehensive lightweight rescue course showing :RPM" belay
ratsar.org/wp-...
How to tie a single strand purcell prussik
• PURCELL PRUSIK *Single...
One source arguing against hand tied prussiks
www.capitaltec...
"Are You Really On Belay" by John Dill, 1991
verticalsectio...
The body of research on rescue belay systems: sarrr.weebly.co...
Rigging for Rescue's research on VT Prussik Belays
riggingforresc...
"The difference is INSANE" 6mm vs 7mm cord
• The difference is INSANE
CMC Sewn Loop prussiks
www.cmcpro.com...
How to tie a Valdotain Tresse
www.101knots.c...
Wonderful video, I'm glad I found this. Love the citations!
Thanks. I have a pretty solid personal background in technical rope rescue but stand on the shoulders of giants. I think that all too often people just do what they were taught without thinking critically about it, or seeking research to back that up. Hence trying to cite research and/or other opinions to back up my lectures.
The valdotain tresse look similar to a hitch used in the 70s-80s called a Dog and Tail.
Interesting! I never heard of that. Will do some homework. Thanks.
Hello Philip, excellent and clear delivery. Does a sewn prusik retain all its value as opposed to a tied prusik? Or has it been shown that a tied prusik either maintains its full value or is diminished in its overall strength? Thank you for your great videos. Look forward to more.
Offhand, I can't cite testing on sewn versus tied prusik loop strength. But practically speaking, strength is not the issue. Any properly tied friction hitch will slip far before the cord fails. Personally I think the shift towards sewn over tied prusiks is about quality control, consistency, and bulk. It takes one more potential failure point out of our systems, which improves general safety.
I've performed lots of rescues using tied prusiks and haven't had any bad outcomes. But sewn loops from a reputable manufacturer eliminate the potential for a loop failure due to an incorrectly tied or loosened joining knot.