There is no standard test for this, so it becomes very hard to say. I think/guess/observe/no-really-it-is-a-guess about 5% in the first few trips, and not much past that. For my Imlay Canyon Gear ropes that are 100% polyester, sheath and core, thus perhaps more resistant to shrinkage than other ropes. But what is really true? Could we actually collect some data and find out?
OK, let’s do that.
June 22, 2016 – pulled a brand new 120′ Canyon Fire off the shelf. Actual length = 121 feet (1452 inches)
June 21, 2016 – Imlay Sneak route with 3 ropes used randomly. 5 people. 27 rappels or so total, so used on approximately 9 rappel, mostly single strand. Wet.
Tom is the progenitor of Tom's Utah Canyoneering Guide, Utah's premier canyoneering information resource, and Imlay Canyon Gear, America's #1 maker of canyoneering-specific gear. If he's not canyoneering, he's probably snuggled up with a good book.
Posted on Jul 22nd, 2016