Goto Chockstone Home

  Guide
  Gallery
  Tech Tips
  Articles
  Reviews
  Dictionary
  Links
  Forum
  Search
  About

      Sponsored By
      ROCK
   HARDWARE

  Shop
FREIGHT FREE
in Australia

Black Diamond: "Vario Speed Harness" Classic. One side fits all. Large (pre-threaded) quick-adjsut buckles. Wide nylon webbing. (Recommended for Gym use) SUPER SPECIAL!!!  $59.00
26% Off

Chockstone Photography Australian Landscape Photography by Michael Boniwell
Australian Landscape Prints





Chockstone Forum - For Sale

Buy and Sell Used Climbing Gear Please do not post retail SPAM.

 Page 4 of 5. Messages 1 to 20 | 21 to 40 | 41 to 60 | 61 to 80 | 81 to 92
Author
Used ropes for sale?

mousey
2/05/2007
12:22:20 PM
im not talking it up, im trying to make the mods delete the f---ing thread!
and yes, it will.

anthonyk
2/05/2007
12:22:28 PM
oh you can all get stuffed :P (in the nicest possible way)

well if someone posts something about a rope jump on a discussion forum, you shouldn't be too surprised if it gets, well, discussed..

actually i don't know that much about it anyway or if i'm right or anything but am happy to play devil's advocate and point out when someone else seems to be wrong ;) *stirs the pot again*


anyway the point is that its more chaotic than people assume & when you have a whole lot more energy there is the possibility that it'll get emphasised in various points instead of being nicely distributed according to theories about balanced systems. and parts of the rope with weaknesses are significant not just because they are weaker, but because their properties are different.
gravitychaser
2/05/2007
12:42:19 PM
Sure, rope jumping may work in reality, but will it work in theory?

Jason

Macciza
2/05/2007
2:04:44 PM
Dudes - Bottom line - the rope is not going to break regardless
And I agree with Mousey - Just delete the thread and be done with it . . .

IdratherbeclimbingM9
2/05/2007
2:07:56 PM
It has had a faster rate of hits since mousey changed the title ...

tnd
2/05/2007
3:00:37 PM
On 2/05/2007 Macciza wrote:
>Dudes - Bottom line - the rope is not going to break regardless

That's what Dan Osman thought too.

anthonyk
2/05/2007
3:09:28 PM
On 2/05/2007 tnd wrote:
>On 2/05/2007 Macciza wrote:
>>Dudes - Bottom line - the rope is not going to break regardless
>
>That's what Dan Osman thought too.

considering dan osman used new ropes (at least at first) in his set up, i don't really think you need to go backwards..

anthonyk
2/05/2007
3:44:03 PM
On 2/05/2007 mousey wrote:
>while it has very little to do with the system failing, i assumed it was
>common knowledge that aside from previous jumps on them, the leaning tower
>ropes were left rigged for like a month (incl weeks that osman spent in
>prison) between his last jump and the 2nd last jump...hardly new

and thats a great example to use, one where the system failed and he was killed..

whats with the title "crappy thread about weak people. dont read.", are you saying people are weak for discussing possible risks in something? if people want to do ballsy stuff good on them, yes its great if people have the guts to do dangerous stuff, it can be really inspiring, i love watching the stuff dan osman did. but if you're going to talk about it in a public forum you shouldn't be surprised if people start looking at the hazards from doing it. how many people who go soloing advertise it in public before they do it? not many, and if they do they would hardly be surprised if they hear stuff about what they're risking, what coudl go wrong and what effect it would have on their loved ones if they did. if you're going to talk about it you're probably going to hear stuff you might not like in return.
dalai
2/05/2007
3:49:46 PM
On 2/05/2007 anthonyk wrote:
>whats with the title "crappy thread about weak people. dont read.", are
>you saying people are weak for discussing possible risks in something?

Wow, Mousey hit a nerve! All he has been trying to do is get this thread deleted and has had someone ;-) playing jokes by editing the title opposite to his request to get it deleted...

anthonyk
2/05/2007
3:53:36 PM
but anyway you're right there's very little chance of a rope breaking just under load, its basically unheard of that a rope will break except by being cut or rubbing against something ( http://adventureguides.com.au/PDFs/Dan%20Osman%20Rope%20Failure%20Analysis.pdf ) . but thought it was still worth looking into, there's not many examples of people jumping 250m with old ropes & who would want to be the first to show that it is possible to break a rope under load.. but it'd have to be pretty beaten up to be worse than the weakness from a knot.

anthonyk
2/05/2007
4:00:16 PM
On 2/05/2007 dalai wrote:
>Wow, Mousey hit a nerve! All he has been trying to do is get this thread
>deleted and has had someone ;-) playing jokes by editing the title opposite
>to his request to get it deleted...
>

*sigh* the joys of electronic (mis)communication

blah blah everyone's just talking crap anyway, who cares if it stays or gets deleted? i think ppl can delete their own posts, do you want ppl to do that?

Sabu
2/05/2007
4:06:41 PM
na i think we're all having far too much fun! keep it going on and on and on!!

BigMike
13/05/2007
12:03:18 AM

Just get all the info you need from here...

http://www.youtube.com/watch?v=VtP6D7S5LAk&mode=related&search=

TonyB
15/05/2007
9:08:19 AM
Here's some local guys doing it ... http://www.youtube.com/watch?v=8lAT4-5roH4
Is mousey one of them ?

wallwombat
15/05/2007
9:58:45 AM
I don't think so but one of them looks suspiciously like BundyBear.
TonyB
19/05/2007
8:18:49 AM
It's interesting in looking at this video that most seem to have two equal length ropes. This actually doubles the dynamic force on the climber and the anchors. Unlike the static load which halves the tension in each rope, the dynamic tension in each of two equal length ropes stays the same as with a single rope. The second rope has been added I assume for safety reasons. A better approach would be to have a second rope about 10% longer than the first. If the first rope happens to break, the remaining energy of the fall will be absorbed by the second rope. This allows the normal rope elongation, rather than halving it as with two equal length ropes. Separate anchors should be used. Extra care is needed to avoid tangles or rubbing.

IdratherbeclimbingM9
19/05/2007
9:51:57 AM
Good point TB.
What those jumpers are actually doing is adding (doubling), to the 'load' on themselves (harness etc), by 'not allowing' (ie only at 50%), the ropes to do their 'normal' thing of dynamic energy absorbtion.

A while back a jumper (on a mtn bike), from Hanging Rock in the Blue Mtns who was using doubled ropes kind of did the same thing by default. One rope caught around his handlebar during the fall and ended up 'exploding like a gun-shot' due to the force it took, while the second rope did its 'thing' with a relatively light load due the dissipation achieved by the 1st rope, and saved him.

IMO the ropes boundaries are really pushed when the jumper goes for the 2nd, 3rd, etc. jump. Especially if the ropes are not allowed to 'recover', even if screamers are incorporated. Mind you by having differential elongation due to unequal rope lengths, the 'main' rope will reach it's fatigue state much earlier.
Given this last point if I was a jumper I would be asking myself the question; ~ How worn out with previous falls is the 'main' rope?

IdratherbeclimbingM9
19/05/2007
10:14:14 AM
On 2/05/2007 dalai wrote:
>All he has been trying to do is get this thread
>deleted and has had someone ;-) playing jokes by editing the title opposite
>to his request to get it deleted...

& ak wrote:
>who cares if it stays or gets deleted? >i think ppl can delete their own posts, do you want ppl to do that?

I suspect that some mods 'user rights' can't delete whole threads, but they can lock them, [or change their title ;-) ]
People wholesale deleting posts has happened (twice) before. One of those users is still with us and contributes again (which is good). The other lurks from time to time, and I was saddened to see him go, as I valued his contribution highly.
TonyB
19/05/2007
11:43:22 AM
Interesting. I assume the failure of the rope was due to frictional heating as the rope ran around the handlebars, rather than a simple failure due to exceeding the rope yield stress ?

>... One
>rope caught around his handlebar during the fall and ended up 'exploding
>like a gun-shot' due to the force it took, while the second rope did its
...

IdratherbeclimbingM9
19/05/2007
11:53:46 AM
It was a fair while ago; a year or two after Lucas Trihey did his well publicised jump from there and my memory of reading about it (also in Wild magazine?), is sketchy now.
On further reflection I think it may have been another part of the bike frame and not the handlebar. Maybe the 'rider' wasn't too sure himself! The 'rider' took a forward tumbling fall, & one rope "exploded" during the fall.
If my recall is half correct I think the fellows backup rope was a static !!!!!
... all the more reason to let the 'main' rope do its thing!

 Page 4 of 5. Messages 1 to 20 | 21 to 40 | 41 to 60 | 61 to 80 | 81 to 92
There are 92 messages in this topic.

 

Home | Guide | Gallery | Tech Tips | Articles | Reviews | Dictionary | Forum | Links | About | Search
Chockstone Photography | Landscape Photography Australia | Australian Landscape Photography

Please read the full disclaimer before using any information contained on these pages.



Australian Panoramic | Australian Coast | Australian Mountains | Australian Countryside | Australian Waterfalls | Australian Lakes | Australian Cities | Australian Macro | Australian Wildlife
Landscape Photo | Landscape Photography | Landscape Photography Australia | Fine Art Photography | Wilderness Photography | Nature Photo | Australian Landscape Photo | Stock Photography Australia | Landscape Photos | Panoramic Photos | Panoramic Photography Australia | Australian Landscape Photography | Mothers Day Gifts | Gifts for Mothers Day | Mothers Day Gift Ideas | Ideas for Mothers Day | Wedding Gift Ideas | Christmas Gift Ideas | Fathers Day Gifts | Gifts for Fathers Day | Fathers Day Gift Ideas | Ideas for Fathers Day | Landscape Prints | Landscape Poster | Limited Edition Prints | Panoramic Photo | Buy Posters | Poster Prints