Figure-eight knot
| Figure-eight knot | |
|---|---|
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| Names | Figure-eight knot, figure-of-eight knot, Savoy knot, Flemish knot, double stopper |
| Category | Stopper |
| Efficiency | 80% |
| Origin | Ancient |
| Related | Stevedore knot, figure-eight loop, figure-eight follow through, directional figure eight |
| Releasing | Jamming |
| Typical use | General-purpose stopper knot. Replaces the common overhand knot in many uses. |
| ABoK | #420 #520 #570 |
| Conway Notation | 2 2 |
| A/B notation | 41 |
| Instructions | [1] |
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-of-eight will also jam, but is usually more easily undone than the overhand knot.
The figure-eight or figure-of-eight knot is also called (in books) the Flemish knot. The name figure-of-eight knot appears in Lever's Sheet Anchor; or, a Key to Rigging (London, 1808). The word of nowadays is usually omitted. The knot is the sailor's common single-strand stopper knot and is tied in the ends of tackle falls and running rigging, unless the latter is fitted with monkey's tails. It is used about ship wherever a temporary stopper knot is required. The figure-eight is much easier to untie than the overhand, it does not have the same tendency to jam and so injure the fiber, and is larger, stronger, and equally secure.
The stevedore knot is the figure-eight knot with two half twists added before the end is finally stuck.
The figure-eight loop is used like an overhand loop knot. This type of knot can be used in prusik climbing when used in conjunction with a climbing harness, a climbing rope, and locking carabiner designed for climbing, to ascend or descend with minimal equipment and effort.
The figure-eight bend knot is used to "splice" together two ropes, not necessarily of equal diameter. This knot is tied starting with a loose figure-eight knot on one rope (the larger-diameter one if unequal), and threading of the other rope's running end through the first figure eight, starting at the first figure-eight's running end and paralleling the path of the first rope through the figure eight until the second's ropes running end lies parallel against first's standing end. The result is two figure-eight knots, each partly inside the other and tightening its hold on the other when they are pulled in opposite directions. This can be a permanent or temporary splice. While it precludes the ropes' slipping relative to each other, it is a typical knot in having less strength than the straight ropes.
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Wikipedia