Chockstone Forum

      Sponsored By
      ROCK
   HARDWARE

Chockstone Photography

Australian Landscape Prints

Chockstone Forum - Gear Lust / Lost & Found

Rave About Your Rack Please do not post retail SPAM.

Topic Date User

cut(e) twins or double trouble? 3-Aug-2009 At 9:28:38 PM JamesMc

Message

On 29/07/2009 anthonyk wrote:

>i've burnt through the sling of a quickdraw that a rope ran over, it ran
>over the bit of the sling on the inside of the carabiner. after seeing
>that any kind of nylon-nylon friction is something i'd say to definitely
>do without. you potentially end up with the same situation with doubles
>when they get tension at different times, if the slack rope is on the bottom
>the tight rope is going to rub against it when it takes the load, and it'll
>move a fair way while its under tension.

Sounds like a totally different situation. Presumably your sling and your rope were through the same krab, rather than your rope running through the sling. So I assume that the rope was running over the top of the sling, and the contact pressue between them would have been about double the rope tension. If a rope runs over the top of another rope in a crab, it will "fall off" the top of the other rope and end up only loading the karabiner.

Without significant force pressing one rope against the other, there will be negligble heating due to friction between them.

JamesMc

JamesMc