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tradrenn


Jan 20, 2010, 8:32 PM
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Interesting PDF (Cams)
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http://justinreina.com/...E478_FinalReport.pdf

If it was posted before, sorry.

If not, I hope you enjoy it.

V.


adatesman


Jan 20, 2010, 8:38 PM
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tradrenn


Jan 20, 2010, 8:42 PM
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How about saving it with the rest of all the good stuff you have around here.


adatesman


Jan 20, 2010, 8:49 PM
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currupt4130


Jan 20, 2010, 9:17 PM
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Very cool.


acorneau


Jan 21, 2010, 8:26 AM
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Figure 22 is awesome:




(This post was edited by acorneau on Jan 21, 2010, 8:26 AM)
Attachments: Picture 3.png (24.8 KB)


bandycoot


Jan 21, 2010, 9:30 AM
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Using the established maximum loading scenario for a two-hundred pound climber falling from a height of thirty feet with seven percent rope-stretch, a maximum impact loading of 2,850 pounds
was established.

Most ropes stretch close to 30% dynamically. Where are they getting 7% from?


(This post was edited by bandycoot on Jan 21, 2010, 9:33 AM)


currupt4130


Jan 21, 2010, 9:43 AM
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I caught that too when I was reading it. I think 7% is the max allowable for static ropes, but I could be wrong.


acorneau


Jan 21, 2010, 9:54 AM
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bandycoot wrote:
Most ropes stretch close to 30% dynamically. Where are they getting 7% from?

7% could be the static elongation of a dynamic rope.


bandycoot


Jan 21, 2010, 9:57 AM
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It could be, but that's irrelevant since they are evaluating, "falling from a height of thirty feet"


jeremy11


Jan 21, 2010, 10:25 AM
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Great read, thanks! Very interesting.



I had an aid fall similar to that falling climber diagram, except the belayer was a big rock (solo aid) and the pro was a #2 frost sentinel, sideways in a shallow placement.
I landed upside down, about 10 feet off the ground Shocked


ptlong


Jan 21, 2010, 11:58 AM
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bandycoot wrote:
In reply to:
Using the established maximum loading scenario for a two-hundred pound climber falling from a height of thirty feet with seven percent rope-stretch, a maximum impact loading of 2,850 pounds
was established.

Most ropes stretch close to 30% dynamically. Where are they getting 7% from?

It's probably a typo. The force doesn't match a 7% stretch but is more or less what you'd get if you assumed a 30% stretch.


agdavis


Jan 21, 2010, 12:38 PM
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tradrenn wrote:
http://justinreina.com/...E478_FinalReport.pdf

If it was posted before, sorry.

If not, I hope you enjoy it.

V.

I'm not sure if this is your original work, but if so, do you have an abstract? I am way too lazy to read through it.


tradrenn


Jan 21, 2010, 8:06 PM
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bandycoot wrote:
In reply to:
Using the established maximum loading scenario for a two-hundred pound climber falling from a height of thirty feet with seven percent rope-stretch, a maximum impact loading of 2,850 pounds
was established.

Most ropes stretch close to 30% dynamically. Where are they getting 7% from?

30 % refers to dynamic elongation
7 % refers to static elongation.


tradrenn


Jan 21, 2010, 8:25 PM
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Did you notice what it says under the drawing ?

"Maximum force"


tradrenn


Jan 21, 2010, 8:28 PM
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agdavis wrote:
I'm not sure if this is your original work, but if so, do you have an abstract? I am way too lazy to read through it.

It's not my work, it's just something I found while researching something else on Google.


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