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The artillery loop [1] is a knot with a loop on the bight for non-critical purposes. The artillery loop must have the loop loaded or it will slip and contract easily. It is an inferior knot to the alpine butterfly knot, [2] possibly dangerously so, in that it can be yanked out of shape and turn into a running knot or noose.
The result is slightly larger and more difficult to untie. It forms the first part of the surgeon's knot and both sides of a double fisherman's knot. According to The Ashley Book of Knots, "A double overhand knot tied in a cat-o'-nine-tails is termed a blood knot." [4] When weighted, it can be difficult to untie, especially when wet. [5] [6]
There is a potential with beginners to wrongly tie the bowline. This faulty knot stems from an incorrect first step while tying the rabbit hole. If the loop is made backwards so that the working end of the rope is on the bottom, the resulting knot will be the Eskimo bowline, looking like a sideways bowline, which is also a stable 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.
The double harness bend is an unfinished Fisherman's knot (or even a Double fisherman's knot): the end needs to go through its own half hitch (twice) to form a (double) overhand knot. The double harness bend is an unfinished Blood knot: The half hitches need to take one or several turns around both ropes before going through the eye in the middle.
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The surgeon's knot is a surgical knot and is a simple modification to the reef knot. It adds an extra twist when tying the first throw, forming a double overhand knot . The additional turn provides more friction and can reduce loosening while the second half of the knot is tied. [ 1 ]
It consists of interlocking overhand knots, and can jam under moderate strain. It is similar to the Zeppelin bend. When assessed against other bends in stress tests using paracord, it was found to be "not as strong as the blood knot, similar to the reverse figure of eight and stronger than the fisherman's bend, sheet bend or reef knot". [1]