Login with Facebook
 ADVANCED
is this a safe top rope anchor?
View Latest Posts in This Forum or All Forums
   Page 3 of 3.  <<First   <Prev   1  2  3
Follow replies to this topic? Notify me at the top of web site.
1

Email me.
 
 
By Steve Davis
From Seattle, WA
Apr 21, 2013
First pic
Could someone demonstrate how the super 8 is no more redundant than the OP's figure 8? I've read arguments on both sides, but can't visualize it.

FLAG
By MTKirk
From Billings, MT
Apr 21, 2013
Me on Supercrack
Steve Davis wrote:
Could someone demonstrate how the super 8 is no more redundant than the OP's figure 8? I've read arguments on both sides, but can't visualize it.


Get yourself a piece of cheap cord/string and tie a super eight in it, next cut one of the loops, then pull on the loop as if it were the master-point. You will notice that both loops fail.

The BHK won't do this. Another knot that won't fail this way, uses less rope, and is easier to untie after loading than almost any other knot is the Bowline on a bight.

FLAG
By Greg D
From Here
Apr 21, 2013
Out of the blue.  Photo by Mike W. <br />
MTKirk wrote:
Another knot that won't fail this way, uses less rope, and is easier to untie after loading than almost any other knot is the Bowline on a bight


Ummm, hello. Same problem as super eight.

FLAG
By Dan Allard
From West Chester, PA
Apr 22, 2013
Day at Summersville Lake
Greg D wrote:
Ummm, hello. Same problem as super eight.


yeah, what Greg said is correct because again, the integrity of those two loops is dependent on that single initial bight. If any of those '4' strands fails, the whole thing goes.

FLAG
By Allen Corneau
From Houston, TX
Apr 23, 2013
Dan Allard wrote:
yeah, what Greg said is correct because again, the integrity of those two loops is dependent on that single initial bight. If any of those '4' strands fails, the whole thing goes.



Can anyone show a documented case of a Super-8 or a bowline on a bight anchor failing because the "fold over" bight failed?

I'm in serious doubt it ever has so I'd put this in the category of "technically possible but practically impossible".

FLAG
By Steve Davis
From Seattle, WA
May 17, 2013
First pic
Yes, the super eight failed.

Get yourself a piece of cheap cord/string and tie a super eight in it, next cut one of the loops, then pull on the loop as if it were the master-point. You will notice that both loops fail. The BHK won't do this. Another knot that won't fail this way, uses less rope, and is easier to untie after loading than almost any other knot is the Bowline on a bight.
>

FLAG
By Allen Corneau
From Houston, TX
May 18, 2013
Steve Davis wrote:
Yes, the super eight failed.



Site your documentation.

FLAG
By Alex Washburne
May 18, 2013
I eat crack for breakfast.
Hey Aleksei!

You've received some good feedback mixed with some quintessential hilarious MP offshoots. To add my own perspective, I'll start with a reminder that a key feature of climbing is not taking risk, but managing it.

You can climb on this anchor many times and probably not die, especially if it's not rubbing over any edges. If you take home one message from all of this forum, take home the BHK - know it's out there and know it would make your system a little bit better (a LOT better if the master point was around anything sharp, and a good thing to do as a default).

You are wise to practice this in your apartment, and I'm sure you are reading up a bit, but remember that it would be especially wise to connect with someone who has a good deal of experience and shares your level of acceptable risk (a hard thing to judge - how is an aspiring outdoors climber to judge the experience, level-headedness, and quality of instruction of an experienced climber... but that's a topic for another MP discussion). Fiendishly devour the classic textbooks - "Freedom of the Hills", "The Mountaineering Handbook", and "Rock Climbing Anchors" to get your self-education, but remember there is no substitute for climbing with an experienced sensei when it comes to becoming fluent with these skills and thinking about all the contingencies as you're building an anchor on the cliff. MP has a lot of wise people who can give you a lot of good feedback, but it also has a lot of people who may not think like mere mortals and would tell you they'd take a whipper on a girth hitch around a dead log, and so I wouldn't recommend a dear friend try crowdsourcing something as high-stakes as anchor-building skills. One big, major step towards managing risk in climbing is finding a sensei you can trust, and climbing with them again, and again, and again.

Otherwise, your anchor looks good. I would take a whipper on that ;-D.

FLAG
 
By Steve Davis
From Seattle, WA
May 18, 2013
First pic
I did just as MTKirk suggested. I tied a piece of twine into a super eight, cut one of the loops, and weighted the other (with my finger). One of the cut strands pulled through the knot and the remaining loop failed.

Edited for tone.


johnnyrig wrote:
So when you cut one loop of the two "bunny ears", looks like the remaining loop, and how it's threaded through the rest of the 8 is similar in form to the finish of a bowline. Which is secure, generally, if you remember to finish it. Pull tests showing evidence of failure? Personal experience?

FLAG
By bearbreeder
May 19, 2013
some of you are gonna freak out at whats on the AAI blog about anchors ;)

alpineinstitute.blogspot.ca/20...

FLAG


Follow replies to this topic? Notify me at the top of web site.
1

Email me.
Page 3 of 3.  <<First   <Prev   1  2  3