Often used for Dock Lines.Quick-release knot to hold a boat temporarily to a dock.Quick-release method of securing a load or tarpaulin.Very secure slide and grip knot that may grip on tapered pole.Simple (weak) hitch to attach a rope to a pole or ringExcellent way of securing a rope to a post or ring.Secure method to control the descent of a heavy load.Simple wrapping hitch used in rescue work or rappelling.Valuable knot usually used for securing loads or tarpaulins.Slide and Grip knot: takes strain in only one direction.Temporary hitch for a light load or animal. Thethinner rope can be a lanyard with eyes at each end or any line that has loops handtied (method shown below) at its ends.The Distel hitch is aslide and grip knot that is popular with arborists for ascending or descending aclimbing rope. In most cases descending with the GriGri requires one hand on the descent control handle and one hand on the rope, so it's a bit inconvenient to use. (Readers who don't like math can skip ahead to the conclusion below. For short climbs it may be possible to simply throw the climbing rope over a tree limb, but for any higher ascent the process has multiple phases:But since then, for a number of reasons, I've gotten much more enthusiastic about single rope ascents/descents of trees, suitable rappelling sites and elsewhere, for sport, exercise and to acquire new skills. The Frenck Prusik controls the descent rate while handling only a small percentage of the descent energy, so the hitch isn't likely to melt under load like the Distel Hitch method described above. The problem is that the weight often tends to be deflected by leaves and not get to the intended target.Single rope ascent is a very useful skill, a source of vigorous exercise, and a confidence-builder as well. How much energy does he expend while climbing?Remember these key points for what follows:Now for the somewhat more complex task of ascending a single rope. The Distel hitch is a slide and grip knot that is popular with arborists for ascending or descending a climbing rope. Also, very important, if the climber releases his grip on the French Prusik, the descent stops. If I climbed that high I would freeze up and rescuers would have to save a quivering mass of Jello." Here are some devices designed to assist an unsupported ascent:With little $g$ at our disposal, and given that we want an energy differential for a height $h$, we can write this greatly simplified equation:This may surprise some of my readers, but there's some physics involved in climbing and descending, and since I do mathematical physics, I want to include some derivations that, in spite of their seemingly esoteric origins, are worth reading, for practical application as well as knowledge of physics.Figure 3: Typical rope size labeling (Petzl I'D S)After some experimentation I settled on the setup shown in Figure 15. This made it completely unusable with my Petzl descender — the rope jammed in the descender mechanism and refused to budge.The figure-8 descender is a traditional descent device with disadvantages that for some may outweigh its simplicity and low cost. My screams would have set off car alarms had they existed back then. The idea is that if one uses a light enough line, such as a monofilament nylon fishing line with a small weight tied to the end, the line can be lofted to a substantial height. Feb 28, 2020 - Explore chrissscully's board "SAR - Rope Rescue", followed by 1270 people on Pinterest. Over the years I've come to see that a lifelong paralyzing fear of heights came directly from that experience, but I didn't see a way to overcome it.This section relates mostly to preparations for ascending a tree, and the problem of lofting a rope to a desired height for ascent.
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