Newsflash

TCI Founder's Blog
Read what Peter "Treeman" Jenkins has to say about a variety of tree climbing issues and adventures. Treeman's Blog
 

Login

 
Advertisement
 
TCI Message Board
Welcome, Guest
Please Login or Register.    Lost Password?
Go to bottom Post Reply Favoured: 0
TOPIC: weight limit?
#122898
Bradley Ford (Visitor)
Senior Boarder
Posts: 76
graphgraph
User Offline Click here to see the profile of this user
weight limit? 5 Years ago  
What is the weight limit for safely descending on a friction hitch with a dynamic climbing system? I know there are variables such as type of hitch, type of rope, and friction from the tie in point, but I'm hoping to find some reasonably determined guideline.

Thank you,

Bradley Ford
 
 
  The administrator has disabled public write access.
#122899
nickfromwi (User)
Platinum Boarder
Posts: 766
graphgraph
User Offline Click here to see the profile of this user
5 Years ago  
Wow, good question!

First off, there are so many types of hitches a person could choose. And if you find one that slips at low loads, many of these you can just add a wrap or two to give a little more friction.

There are reports of prusiks and klemheists not slipping until the 1000lb range. This is not to say, "A prussik can hold a thousand pounds." Under the right (or should I say wrong) circumstances, they can slip at significantly lower loads.

Maybe we should set up a test.

love
nick
 
 
 
Would you like a lanyard spliced up, or anything else for that matter??? Give me a call- 323-384-7770 or nick@splicesbynick.com
  The administrator has disabled public write access.
#122940
Bradley Ford (Visitor)
Senior Boarder
Posts: 76
graphgraph
User Offline Click here to see the profile of this user
5 Years ago  
Nick,

Were the tests you reference done on a static or dynamic climbing system? And were they determing the weight limit for safely descending (controlled slipping with the option of stopping) or for causing the hitch to fail?

I have safely descended (knock on wood ) with a dynamic climbing system on 1/2'' XTC using a 5-3 Blake's; my climbing weight is ~175 lbs., so I can offer that the limit is at least 175 lbs.

Bradley Ford
 
 
  The administrator has disabled public write access.
#122941
Tear (Visitor)
Senior Boarder
Posts: 70
graphgraph
User Offline Click here to see the profile of this user
5 Years ago  
My climbing weight is about 195, on the same system, and I've never worried. When I was taking my facilitator course, I also descended with Tim Kovar's, who's a lot bigger than I,weight on my rope, and was fine.

Joshua
 
 
  The administrator has disabled public write access.
#122947
nickfromwi (User)
Platinum Boarder
Posts: 766
graphgraph
User Offline Click here to see the profile of this user
5 Years ago  
Here is one test. Not super scientific, but it get's the point accross.

http://www.xmission.com/~tmoyer/testing/pull_tests_11_98.html

There is a lot of pulling going on there. The prussik info is down towards the bottom.

I've seen prussik hold many hundred pounds, and I've seen others slip at way less than a hundred. It's just a matter of trying it out low and slow. Get used to your materials. And take it easy when you try new things!

love
nick
 
 
 
Would you like a lanyard spliced up, or anything else for that matter??? Give me a call- 323-384-7770 or nick@splicesbynick.com
  The administrator has disabled public write access.
#122959
Bradley Ford (Visitor)
Senior Boarder
Posts: 76
graphgraph
User Offline Click here to see the profile of this user
Does ANSI Z133 cover this? 5 Years ago  
Does anyone know if the ANSI Z133 safety standard covers safe descending weight limits for hitches with dynamic climbing systems?
 
 
  The administrator has disabled public write access.
Go to top Post Reply
Powered by FireBoardget the latest posts directly to your desktop
Don't be afraid to go out on a limb--that's where the fruit is.  --Anonymous