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Atwood rope
- Thread starter Sincyrman
- Start date
JBDaddy
Well-Known Member
On your way home from that purchase, stop at your insurance agent and make sure your life insurance and disability is up to date 
I'm not a rope snob, or climbing geek. But even I know that using this rope to support your fragile body 12-20 feet off the ground is a Bad Idea (tm).
That rope talks about a 2200 pound tensile strength and 220 pound working load limit. I'm not even doing the fall/shock-load math. Just compare that to a professional climbing rope stats: Samson's Predator rope (standard issue with a kestrel harness) has an ABS (average breaking strength) of 6,000 pounds.
Tensile strength is the lab-average breaking weight of the rope when brand new. Working load is usually 10-15% of that. Now consider that every time you tie a knot in it, you lose a huge fraction (35-50%) of that tensile strength. 1 knot in a 2200 pound tensile strength rope means you're down to 110 pounds of working load.
No thanks.
I'm not a rope snob, or climbing geek. But even I know that using this rope to support your fragile body 12-20 feet off the ground is a Bad Idea (tm).
That rope talks about a 2200 pound tensile strength and 220 pound working load limit. I'm not even doing the fall/shock-load math. Just compare that to a professional climbing rope stats: Samson's Predator rope (standard issue with a kestrel harness) has an ABS (average breaking strength) of 6,000 pounds.
Tensile strength is the lab-average breaking weight of the rope when brand new. Working load is usually 10-15% of that. Now consider that every time you tie a knot in it, you lose a huge fraction (35-50%) of that tensile strength. 1 knot in a 2200 pound tensile strength rope means you're down to 110 pounds of working load.
No thanks.
- Joined
- Mar 10, 2016
- Messages
- 1,635
Way lower rating than a normal climbing rope and way thicker. You can pick up Monster 10mm static climbing rope for 80 cents a foot. And it'll work with a ropeman 1.
https://www.backcountrygear.com/monster-10mm-static-rope-black.html
To be fair, that source is backordered for months.
I was only curious because the I heard that the HSS rope only had about a 1000 lb breaking strength, and guys are using that as a tether. I'm not excited about falling 20 feet from a tree. I was just impressed about the light weight aspect of the rope.
In the back of my mind, I'm still wondering what it would feel like to experience a 1000 lb force. Or 2000 or 6000. I'm not trying to be argumentative.
Just asking because I am trying to shed a much weight as possible.
But, as @JBDaddy points out, not by taking unnecessary risks. If the rope failed, I probably wouldn't be in the air long, but long enough question my decision!
In the back of my mind, I'm still wondering what it would feel like to experience a 1000 lb force. Or 2000 or 6000. I'm not trying to be argumentative.
Just asking because I am trying to shed a much weight as possible.
But, as @JBDaddy points out, not by taking unnecessary risks. If the rope failed, I probably wouldn't be in the air long, but long enough question my decision!
It didn't come across argumentative at all. It's a reasonable question. The way my old safety coordinator used to explain it was that thousands of climbing accidents have been investigated over the decades. The result of those investigations has shown that 5000 lbs (may be 5400 now, not sure) is a good minimum breaking strength to be above. It isn't calculated, it is isn't theorized, experience has shown that to be a good number and that by default takes into account wear and tear, knot strength reductions, poor bend radius, etc.
We're rec climbers, not Arborists, so I can see dropping a little below that and being fine but stil I believe it's a pretty solid recommendation. With modern materials and rope construction it's pretty easy to stay above that number.