Climbing gear and the weather

[Sviatoslav Tulin]

5 hours ago, Joe Newton said:

You're quite right, and he's wrong. 

A, haha, both of you talking bull shit, obviously. Most modern arb ropes are kernmantle construction, atleast 50 to 50 core to sheath, sheat is for abrasion, core for strength, go and check any manufacturer documentation. 

Edited May 22, 2022 by Sviatoslav Tulin

[topchippyles]

10 hours ago, Sviatoslav Tulin said:

A, haha, both of you talking bull shit, obviously. Most modern arb ropes are kernmantle construction, atleast 50 to 50 core to sheath, sheat is for abrasion, core for strength, go and check any manufacturer documentation. 

 

[openspaceman]

I thought kernmantle ropes were a woven sheath over a parallel fibre core, arb ropes now are multiplait core and cover.

[Mark Bolam]

Pretty sure it depends on which rope it is.

 

[Sviatoslav Tulin]

All specs are in public domain, also explanation what is kernmantel rope construction also there, check the strength of core in N, not in mass percentage, in last 10 years I seen only one rope, not kernmatel it was Yale, can't remember fancy name of it. So I am out of this from now. 

[openspaceman]

47 minutes ago, Mark Bolam said:

Pretty sure it depends on which rope it is.

 

Yeah and too complicated a subject for me but it does seem to confirm that kernmantle originally meant the cover was not load bearing and the core was parallel fibres whereas the double multiplaits do depend on the cover for strength.

 

I can remember, pre 1970, being told to feel for damage to the core which wasn't visible on the sheath when rock climbers were transitioning from 13mm cable laid nylon to twin 10mm kernmantle. I never saw kernmantle used in arb and started tree work with prussic knot and cable laid nylon before moving to military abseil line. I am totally confused by the options available now

[Tommy_B]

Very aggressive for rope discussion but hey ho!

 

16 strand rope has all the strength in the cover, the core strands are just there to keep the rope round. 

Double-braid will share some of the load equally between the cover and the core. True Kernmantle ropes will hold the majority of the strength in the core and the cover just protects it. Because the Climbing ropes we commonly use in Arb are going to be Double-braid, I would say that Mr Bullman and Joe are indeed correct. Plus with the fact there is a ropeguide up there, no sane person is using 11mm Kern in a Ropeguide so we can rule out Kernmaster or Globe I think...

We could talk about Vectran and Dyneema ropes and all the other Hi-mod fibres if you like but unless the OP's friction cord was left tied on the rope, there isn't much point.

 

I'm a bit intrigued to the circumstances that would cause an ART ropeguide and a rope to be left in the tree for that length of time. I do remember a redirect pully being left in a tree for a few months before we climbed it again and found it. I'd be dubious of using those items again to be quite honest with you. Unless they were bought brand new on the morning they were left there, they will have made their own cost back so I would lean towards just replacing them. 

[Steve Bullman]

12 hours ago, Sviatoslav Tulin said:

A, haha, both of you talking bull shit, obviously. Most modern arb ropes are kernmantle construction, atleast 50 to 50 core to sheath, sheat is for abrasion, core for strength, go and check any manufacturer documentation. 

Havent you just contradicted yourself? If they are 50/50 core to sheath then how are you arguing ALL the strength is in the core.

 

ps, i don't appreciate your bull shit comment. I rarely comment on technical matters unless I have some inkling of what i'm talking about.

 

[Mark Bolam]

I would probably retire the rope to light rigging duties or tagline.

 

The ART Ropeguide will be ruined, you’d be best off selling that to me for £20.

[Sviatoslav Tulin]

2 hours ago, Steve Bullman said:

Havent you just contradicted yourself? If they are 50/50 core to sheath then how are you arguing ALL the strength is in the core.

 

ps, i don't appreciate your bull shit comment. I rarely comment on technical matters unless I have some inkling of what i'm talking about.

2 hours ago, Steve Bullman said:

Havent you just contradicted yourself? If they are 50/50 core to sheath then how are you arguing ALL the strength is in the core.

 

ps, i don't appreciate your bull shit comment. I rarely comment on technical matters unless I have some inkling of what i'm talking about.

 

U are snowflake Steve, if word bullshit insulted u so much, so I apologise to anyone who feel hurt by me, I still stand my ground that core of kernmantel rope carry most of the strength of the rope, or atleast  half of it.