I use Kevlar for the foot loop on my frog system for years. I worked great.
KM Sent from mobile device Kevin McGowan Photography 5250 Gulfton, Suite 2F Houston TX 77081 Studio: (713) 665-3818 Cell: (281) 433-2474 > On Jun 21, 2014, at 12:42 AM, David <[email protected]> wrote: > > In the news today, it was announced that the chemist credited with the > discovery of Kevlar, > has passed away. Stephanie Kwolek was her name. > > Sometime around 1986 or 87, I was taking a materials science course at > A&M and had access to a tensile-test machine. I asked the professor > if I could test a piece of 5mm Kevlar cord. > > I put a figure 8 knot in each end. and tied each end to the steel bar > connectors. I think I had about 15 inches between the knots. > > It broke in the middle of the upper knot at around 10,000 pounds. > The professor was > quite surprised. > > I used the cord in my Mitchell System, from my foot to an upper Jumar, > several times over a 2 year period, on some pits that were under 200 > feet. At the foot attachment, I tied the Kevlar cord into a > chicken-loop rig, described by James Jasek ( I think ) in a Texas > Caver in the late 70's or early 80's. So that the Kevlar cord was > the only thing holding my foot to the Jumar. I did not tie the cord > to the Jumar eye-hole, but wrapped it around the handle and tied it > off. > > While I would not recommend doing that now, I would say the cord is > light enough to throw in the cave-pack for an emergency or as a > back-up. > > David Locklear > > --------------------------------------------------------------------- > Visit our website: http://texascavers.com > To unsubscribe, e-mail: [email protected] > For additional commands, e-mail: [email protected] > > --------------------------------------------------------------------- Visit our website: http://texascavers.com To unsubscribe, e-mail: [email protected] For additional commands, e-mail: [email protected]
