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Knot

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A knot is an intentional complication made within cordage. These complications serve many purposes, ranging from practical utility to decorative artistry. In a practical sense, knots are used to fasten, bind, or secure objects. They can also serve as stoppers to prevent a rope from slipping through a grommet or eye. Beyond their physical use, knots are also a subject of intense mathematical study. This specific area of mathematics is known as knot theory, which explores the topological intricacy of knotted shapes.

TrefoilKnot 01
TrefoilKnot 01

To understand how knots function, one must recognize the different ways they are classified by their purpose. A hitch is used to fasten a rope to an external object, such as a ring or a stake. A bend is a type of knot used to join two separate ends of a rope together. Loop knots are designed to create a continuous circle within the cordage. A splice is a more complex, multi-strand knot that can include both bends and loops.

Eyes and turns
Eyes and turns

Each category relies on the interaction of different rope parts to maintain its shape under tension.

Every knot is composed of specific anatomical parts. The working end, also called the running or live end, is the active part used to tie the knot. The standing end is the longer, inactive part of the rope. The section of rope between the knot and the standing end is called the standing part. A bight is any curved or slack section of the rope. Within these structures, you may find turns, which are curves with crossed legs, or round turns, which encircle an object completely.

Ansted Sea Terms 1898 - Names of the parts of a rope
Ansted Sea Terms 1898 - Names of the parts of a rope

Understanding these components is essential for successful ropework.

Knots have been a part of human history for thousands of years. Chinese knotting emerged as a decorative folk art during the Tang and Song Dynasties, between 960 and 1279 AD. This art form became even more popular during the Ming Dynasty. There are eleven main types of Chinese knotting, including the Pan Chang knot and the good luck knot. Other knots have specific historical origins, such as the sheepshank knot from 1627. The Western Union splice emerged during the early era of telegraphy.

Inca Quipu
Inca Quipu

In many professional fields, knot-tying skills are vital for safety and success. Sailors, climbers, and arborists must master complex systems to perform their jobs. In mountainous environments, rescuers use specific knots like the prusik, the munter hitch, or the clove hitch. These allow them to set up rappel systems or hauling systems to move people across ravines. Truckers use a trucker's hitch to gain a mechanical advantage when securing heavy loads. Even surgeons and fishermen rely on the precision of specific knots.

School for Sailors NGM-v31-p351
School for Sailors NGM-v31-p351

While knots are incredibly useful, they also change the physical properties of the rope. Making a knot actually weakens the cordage. The bending, crushing, and chafing forces required to hold a knot in place place uneven stress on the rope fibers. Because of this, a rope will almost always fail at or near the knot when it reaches its breaking point. This loss of strength is measured as knot efficiency, which is the breaking strength of a knotted rope compared to an unknotted one. Most common knots have an efficiency between 40% and 80%.

Bowline (PSF)
Bowline (PSF)

Knots can also fail in ways other than breaking. A knot might slip, where the tension pulls the rope back through the knot until it unravels. A knot can also capsize, which means it changes its form and rearranges its parts. This can happen spontaneously if a knot is used incorrectly. Some knots are also described as jamming knots because they are very difficult to untie after they have been loaded. Conversely, non-jamming knots, like the Zeppelin bend, remain easy to undo.

Finally, knots connect to various specialized crafts and scientific disciplines. In the world of textiles, macramé is a technique that creates structures exclusively through knotting. This can produce both flat work and three-dimensional objects for decoration. In science, researchers are developing special fibers that change color in response to strain. These fibers help scientists study how stress moves through different types of knots. This combination of ancient tradition and modern science shows just how complex a simple complication can be.

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🖼️ Images & Media (16)
File:Nf knots.png
Nf knots.png
File:Knopar - 2017.jpg
Knopar - 2017.jpg
File:Inca Quipu.jpg
Inca Quipu.jpg
File:Jean-François Godefroy Alexandre et le noeud gordien.JPG
Jean-François Godefroy Alexandre et le...
File:Alexander cuts the Gordian Knot.jpg
Alexander cuts the Gordian Knot.jpg
File:Gordischer Knoten Frechen Kirilowitsch.jpg
Gordischer Knoten Frechen Kirilowitsch.jpg
File:Magimagi - Mainbeam.jpg
Magimagi - Mainbeam.jpg
File:Teton tipi tie.jpg
Teton tipi tie.jpg
File:School for Sailors NGM-v31-p351.jpg
School for Sailors NGM-v31-p351.jpg
File:Sjömanssäck - 1991.jpg
Sjömanssäck - 1991.jpg
File:Bowline (PSF).jpg
Bowline (PSF).jpg
File:Eyes and turns.jpg
Eyes and turns.jpg

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