Forums: Climbing Information: The Lab: Re: [mtnrock] Spring constant of a rope: Edit Log




petsfed


Oct 7, 2008, 7:48 PM

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Registered: Sep 24, 2002
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Re: [mtnrock] Spring constant of a rope
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mtnrock wrote:
im trying to find what the maximum height you can climb above your protection before it will pop and i need to know the spring constant of a rope does any one know what it is

Welcome to the wonderful world of real world physics.

You can find the idealized spring constant via rgold's paper in JT512's link, but that's based on the assumption of a massless (or at least trivially low mass) rope/spring. You have to take into account the mass of the rope, and that will throw off your spring constant calculation. Second, you have to take into account rope drag, which will yield different tensions for different parts of the rope, and finally nuances of the fall (sliding, rope getting caught, hitting ledges and the like). Its actually a very complicated dynamical system, one that does not yield to a "formula-fishing" approach. One thing that I can tell you is that under normal circumstances (fall factor less than or equal to 2) with solid pro in good rock (so not micronuts/microcams/micropitons and likewise not rotten or otherwise soft rock), the protection will not fail.


(This post was edited by petsfed on Oct 7, 2008, 7:49 PM)



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Post edited by petsfed () on Oct 7, 2008, 7:49 PM


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