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60 meter fall (fall factor 1); will a 10.5mm rope hold?
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sungam


Dec 6, 2009, 6:47 PM
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Re: [adatesman] 60 meter fall (fall factor 1); will a 10.5mm rope hold? [In reply to]
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adatesman wrote:
Just FYI, there's sizes below the Briefcase Deer. The Pudu (native to Chile) generally weighs a mere 22 pounds as an adult. And on the big end Moose are in the same family and weigh upwards of half a ton.

In either case I'm wondering why this is being discussed in The Lab....
Half a ton?
try 2300 pounds.


It's in the lab because it's all sciency and shit.


johnwesely


Dec 6, 2009, 7:11 PM
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Re: [giza] 60 meter fall (fall factor 1); will a 10.5mm rope hold? [In reply to]
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giza wrote:
skinner wrote:
A person like USnavy comes along and asks an honest question, which if they understood *why* they wouldn't have asked it in the first place. In response he gets ridiculed by Flint, I guess that's the rc.com way huh?


With only a few posts USnavy may be new to climbing, but gawd.. they should know and fully understand all this stuff before they dare to post here!
It's no wonder there are so many who choose to just lurk.

Welcome to rc.com USnavy Crazy
Agreed. This is not a forum to be inquiring about legitimate climbing-related topics. It's the arena of douchebag spraylords where every post will be scrutinized and torn apart not only for its content but also its spelling, grammar, the poster's # of posts, etc.

There are plenty of other forums where your question would be answered from a place of knowledge and mutual respect.

But those forums are not any where near as much fun.


majid_sabet


Dec 6, 2009, 8:51 PM
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Re: [USnavy] 60 meter fall (fall factor 1); will a 10.5mm rope hold? [In reply to]
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There was one climbing expert who knew rope jumping business like no other but he retired long ago. look for Dan Osman, I am sure you will find his extensive research in this business.


Adk


Dec 7, 2009, 5:02 AM
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Re: [majid_sabet] 60 meter fall (fall factor 1); will a 10.5mm rope hold? [In reply to]
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majid_sabet wrote:
There was one climbing expert who knew rope jumping business like no other but he retired long ago. look for Dan Osman, I am sure you will find his extensive research in this business.
Finally someone gets us back on track.


scottek67


Dec 7, 2009, 5:24 AM
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Re: [sungam] 60 meter fall (fall factor 1); will a 10.5mm rope hold? [In reply to]
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sungam wrote:
adatesman wrote:
Just FYI, there's sizes below the Briefcase Deer. The Pudu (native to Chile) generally weighs a mere 22 pounds as an adult. And on the big end Moose are in the same family and weigh upwards of half a ton.

In either case I'm wondering why this is being discussed in The Lab....
Half a ton?
try 2300 pounds.
[image]http://www.jerrysbaitandtackle.com/images/Trophies/Moose/moose.jpg[/image]

It's in the lab because it's all sciency and shit.
mission accomplished Sly and Majid is my new hero! Shocked


knudenoggin


Dec 7, 2009, 11:58 PM
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Re: [scottek67] 60 meter fall (fall factor 1); will a 10.5mm rope hold? [In reply to]
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Having waded through all the one-line add-on posts to nested nonsense,
here's a snippet from the underground world bearing on the OP's question
(imagine doing that!).

In reply to:
There is one thing that I have to say again, though: For the same fall factor, longer falls are worse than shorter falls. There was a time when some of the best UIAA ropes would fail under one fall of UIAA fall factor and thrice the height. On a longer fall, you have more energy and proportionally more rope to absorb it, but NOT proportionally more knots (and in the real world, NOT proportionally more harnesses and proportionally more bodies). Fall factor is a great simplification, but it is just that. Don't believe it, especially for long falls. Don't believe it for cows-tail falls, either. Keep 'em loose.
This points to greater forces, for the want of those missing additional
proportional elements; but I recall a Chouinard catalogue showing plots
of long/short falls and the main difference shown in them was of the
duration at the high forces -- much more in the longer fall.

And I can't believe that a long fall on the static stuff (HTPolyester,
HMPE, Technora) is measurable via FF vs. length of fall -- as it surely
isn't in the case of no-stretch. But I'm unaware of tests of this.

*kN*


cantbuymefriends


Dec 8, 2009, 3:07 AM
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Re: [knudenoggin] 60 meter fall (fall factor 1); will a 10.5mm rope hold? [In reply to]
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We are talking about the force at the end of the rope that is stopping the fallen climber, the force that is "felt" by the climber's body, the harness and the tie-in knot.

If this force is more or less the same for any fall of a given fall factor, what does duplication of knots, harnesses and bodies have to do with it?

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