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Fisherman's knot

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A fisherman's knot is a specific type of bend used to join two lines together. In knot-tying, a bend is a connection that links two separate ropes or cords. This knot is highly valued for its strength and its reliability when used correctly. Because it is so dependable, it is used in many different fields. These include fishing, climbing, arboriculture, and search and rescue operations. Depending on who is using it, the knot may go by many names. It is sometimes called an angler's knot, an English knot, a halibut knot, or a waterman's knot. It is also known as a true lover's knot.

The mechanism of the fisherman's knot relies on two overhand knots. These knots are tied in a specific form known as a strangle knot. To create the bend, each strangle knot is tied around the standing end of the other line. This means the two knots essentially grasp the opposite rope to hold them together. The knot is categorized into three main variations based on the number of turns used. The single fisherman's knot uses one turn in each overhand knot. The double fisherman's knot, also called a grapevine knot, uses two turns. The triple fisherman's knot adds a third turn to each knot to increase security.

Choosing the right variation requires balancing security against the ease of untying. All versions of the fisherman's knot will jam once they are tightened. This jamming makes the knot very difficult to untie, especially after it has been weighted or pulled hard. Generally, a bend with fewer turns is much easier to undo than one with more turns. However, more turns are often necessary for certain materials. Increasing the number of turns in the overhand knots increases the overall security of the bend. This is a critical decision for people using the knot in professional settings.

History shows that this knot has been used by many different cultures for a long time. There is evidence that the knot is indigenous to many groups around the world. As early as the first century, a man named Heraklas described these knots. He wrote about them in an essay regarding their use in surgical and orthopedic medicine. Inuit peoples also used variations of the knot for fishing. They used lines made of baleen, which is a monofilament material. Because baleen is slippery, it can cause knots to slip, much like modern nylon does.

Archaeological finds provide specific dates for the use of these knots. In Nuuk, researchers found triple fisherman's knots made from baleen. These knots have been carbon dated to the year 1700. Scientific testing in the 19th century also highlighted the knot's efficiency. In 1865, the Alpine Club Journal reported on tests performed on manila rope. The researchers tested many different knots to see how much they weakened the rope. They discovered that the fisherman's knot weakened the rope less than any other knot tested.

Modern science helps us understand why the knot behaves the way it does under a load. The way a knot performs depends on the coefficient of friction between the strands. It also depends on the elastic stiffness of the rope and the initial geometry of the knot. The amount of tightening done before use is crucial for the coefficient of friction. Some materials present unique challenges for the knot. For example, ropes with Spectra or Technora cores can fail at high loads, generally above 15 kN. In these cases, the sheath of the rope can separate at the knot. This allows the high-lubricity core to slip through the knot.

Because of these physics, certain knots are recommended for specific materials. The triple fisherman's knot is the best choice when using HMPE or aramid ropes. This extra security helps prevent the core from slipping through. In climbing, the double fisherman's knot is often used to create a cordelette. A cordelette is a closed loop made by connecting the ends of a rope to each other. The knot can also be used for decorative or functional purposes, like joining the ends of a necklace cord. When used for a necklace, the two knots are left separated. This allows the length of the necklace to be adjusted without needing to cut or untie the cord.

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