interesting read on braking forces

[chh]

I'm no mathematician, but there's some useable information in here anyway
http://www.jrre.org/att_frict.pdf

[NZcaver]

FYI - this link was previously posted in a discussion a couple of years ago here.

[pub]

TFS chh! I’m not a mathematician too and I’m new at ropework so the article has given me more to ponder. What really grabbed me, on the initial read, was:

This stick/slip type motion is similar to the dynamic release of energy during an earthquake. The rope stores its energy until the slip friction is exceeded and allows it to release. For 600-foot haul systems, a bounce of over 6 feet is not uncommon. (pg 15)

Jansen, the article was posted in the link in your post above, “heat production while rappelling,” but not really discussed. Maybe that’s because the article does not address heat production per se but we all know heat is a result of friction.

I think the article desires its own thread esp. since it includes stretch & bounce. It would be educational to hear other's comments on this.

Although the link to its reference is dead but I found another source for Physics for Cavers: Ropes, Loads, and Energy*, and it leads to another article, Artificial Rigging Anchors for the Present and Future.


*Another source shows this article was published in: NSS News [National Speleological Society USA] 48:12, December 1990, pp. 316-319

[NZcaver]

Jansen, the article was posted in the link in your post above, “heat production while rappelling,” but not really discussed. Maybe that’s because the article does not address heat production per se but we all know heat is a result of friction.

I think the article desires its own thread esp. since it includes stretch & bounce. It would be educational to hear other's comments on this.

Good call, Jerry. Discuss away!