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adatesman
Jan 21, 2010, 4:38 AM
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tradrenn
Jan 21, 2010, 4:42 AM
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How about saving it with the rest of all the good stuff you have around here.
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adatesman
Jan 21, 2010, 4:49 AM
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currupt4130
Jan 21, 2010, 5:17 AM
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Very cool.
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acorneau
Jan 21, 2010, 4:26 PM
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Figure 22 is awesome:
(This post was edited by acorneau on Jan 21, 2010, 4:26 PM)
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Attachments:
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Picture 3.png
(24.8 KB)
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bandycoot
Jan 21, 2010, 5:30 PM
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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?
(This post was edited by bandycoot on Jan 21, 2010, 5:33 PM)
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currupt4130
Jan 21, 2010, 5:43 PM
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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.
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acorneau
Jan 21, 2010, 5:54 PM
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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.
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bandycoot
Jan 21, 2010, 5:57 PM
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It could be, but that's irrelevant since they are evaluating, "falling from a height of thirty feet"
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jeremy11
Jan 21, 2010, 6:25 PM
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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 
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ptlong
Jan 21, 2010, 7:58 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?
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.
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agdavis
Jan 21, 2010, 8:38 PM
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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.
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tradrenn
Jan 22, 2010, 4:06 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?
30 % refers to dynamic elongation
7 % refers to static elongation.
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tradrenn
Jan 22, 2010, 4:25 AM
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Did you notice what it says under the drawing ?
"Maximum force"
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tradrenn
Jan 22, 2010, 4:28 AM
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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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