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The figure-eight knot or figure-of-eight knot is a type of stopper knot. It is very important in both sailing and rock climbing as a method of stopping ropes from running out of retaining devices. Like the overhand knot , which will jam under strain, often requiring the rope to be cut, the figure-eight will also jam, but is usually more easily ...
A figure-of-eight loop tied using the follow-through method. A figure-eight loop is created by doubling the rope into a bight, then tying the standard figure-eight knot.. In climbing, this knot is used to save time when repeatedly attaching the rope to climbing harnesses, using locking carabiners, such as when a group of people are climbing on the same top-rope.
Figure-eight knot of practical knot-tying, with ends joined. In knot theory, a figure-eight knot (also called Listing's knot [1]) is the unique knot with a crossing number of four. This makes it the knot with the third-smallest possible crossing number, after the unknot and the trefoil knot. The figure-eight knot is a prime knot.
The double bowline is one of the typical tie-in knots used in climbing, along with the figure eight follow through [3] [4] and the Yosemite bowline. [5] The advantage of the double bowline over the figure 8 is that it is easier to untie after being weighted in a fall, [3] [4] and so is used by sport climbers who take multiple lead falls and then have trouble untying their figure eights.
However, tying the knot this way does not allow putting the loop around a fixed object like a tree; to do that, the knot must be tied in a two-stage process by first tying a figure-eight knot, running the end of the rope around the fixed object, and then threading the rope back through and around the figure-8 knot to create the final figure-8 ...
Stevedore knot (also known as Double figure eight): The Stevedore knot is tied at the end of a rope to prevent the end from unraveling, slipping through another knot, or passing back through a hole, block, or belay/rappel device. It is more bulky and less prone to jamming than the closely related figure-of-eight knot.
The directional figure eight (a.k.a. inline figure-eight loop) is a loop knot. It is a knot that can be made on the bight. The loop must only be loaded in the correct direction or the knot may fail. It is useful on a hauling line to create loops that can be used as handholds.
The figure-eight cannot be removed from the rope without detaching the device from the harness, and so could be accidentally dropped, particularly when tackling a rebelay. They also twist the rope which is a particular problem where a rebelay prevents the rope from untwisting.