The taut-line hitch is an adjustable

loop knot This page explains commonly used terms related to knots. B Bend A bend is a knot used to join two lengths of rope. Bight A bight has two meanings in knotting. It can mean either any central part of a rope (between the standing end an ...

for use on lines under

tension Tension may refer to: Science * Psychological stress * Tension (physics), a force related to the stretching of an object (the opposite of compression) * Tension (geology), a stress which stretches rocks in two opposite directions * Voltage or el ...

. It is useful when the length of a line will need to be periodically adjusted in order to maintain tension. It is made by tying a

rolling hitch The rolling hitch is a knot (see also Magnus hitch) used to attach a rope to a rod, pole, or another rope. A simple friction hitch, it is used for lengthwise pull along an object rather than at right angles. The rolling hitch is designed to re ...

around the standing part after passing around an anchor object. Tension is maintained by sliding the hitch to adjust the size of the loop, thus changing the effective length of the standing part without retying the knot. It is typically used for securing tent lines in outdoor activities involving

camping Camping is an outdoor activity involving overnight stays away from home, either without shelter or using basic shelter such as a tent, or a recreational vehicle. Typically, participants leave developed areas to spend time outdoors in more na ...

, by arborists when climbing trees, for tying down aircraft, for creating adjustable moorings in

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areas, and to secure loads on vehicles. A versatile knot, the taut-line hitch was even used by

astronauts An astronaut (from the Ancient Greek (), meaning 'star', and (), meaning 'sailor') is a person trained, equipped, and deployed by a human spaceflight program to serve as a commander or crew member aboard a spacecraft. Although generally r ...

during

STS-82 STS-82 was the 22nd flight of the Space Shuttle ''Discovery'' and the 82nd mission of the Space Shuttle program. It was NASA's second mission to service the Hubble Space Telescope, during which ''Discovery's'' crew repaired and upgraded the tel ...

, the second

Space Shuttle The Space Shuttle is a retired, partially reusable low Earth orbital spacecraft system operated from 1981 to 2011 by the U.S. National Aeronautics and Space Administration (NASA) as part of the Space Shuttle program. Its official program ...

mission to repair the

Hubble Space Telescope The Hubble Space Telescope (often referred to as HST or Hubble) is a space telescope that was launched into low Earth orbit in 1990 and remains in operation. It was not the first space telescope, but it is one of the largest and most vers ...

Naming

The adjustable loop forms of the rolling hitch and Magnus hitch, in addition to being called either of those two names, have also come to be known variously as the taut-line hitch, tent-line hitch, rigger's hitch, adjustable hitch, or midshipman's hitch. These knots are generally shown as being based on one of three underlying hitches: two variants of the rolling hitch ( ABOK #1734 and #1735) and the Magnus hitch (#1736). These three closely related hitches have a long and muddled naming history that leads to ambiguity in the naming of their adjustable loop forms as well. The use of the Ashley reference numbers for these inconsistently named hitches can eliminate ambiguity when required. See the adjacent image for an illustration of these related knots. An early use of the taut-line hitch name is found in Howard W. Riley's 1912 ''Knots, Hitches, and Splices'', although it is shown in the rolling hitch form and suggested for use as a stopper. As not collected in ''Documents of the Assembly of the State of New York'', 136th Session, 1913, Vol. 19, No. 29, Part 5.

Tying

#1855

Ashley uses the name midshipman's hitch for this variation. Based on rolling hitch #1735, this version is considered the most secure but may be more difficult to adjust after being heavily loaded. # Pass the working end around the anchor object. Bring it back alongside of the standing part and make a

half-hitch The half hitch is a simple overhand knot, where the working end of a line is brought over and under the standing part. Insecure on its own, it is a valuable component of a wide variety of useful and reliable hitches, bends, and knots. Two s ...

around the standing part. # Continue by passing the working end over the working part, around the standing part again and back through the loop formed in the first step. ''Make sure this second wrap tucks in between the first wrap and the working part of the line on the inside of the loop.'' This detail gives this version its additional security. # Complete with a half-hitch outside the loop, made in the same direction as the first two wraps, as for a

clove hitch The clove hitch is a type of knot. Along with the bowline and the sheet bend, it is often considered one of the most important knots. A clove hitch is two successive half-hitches around an object. It is most effectively used as a crossing kno ...

. # Dress by snugging the hitch firmly around the standing part. Load slowly and adjust as necessary.

#1856

Based on rolling hitch #1734, this version is the one most often seen named taut-line hitch, typically in non-nautical sources. It is the method currently taught by the

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. The earliest Boy Scout Handbook to include the taut-line hitch was the 5th edition, published in 1948. However it illustrated #1855, the variant shown above. # Pass the working end around the anchor object. Bring it back alongside of the standing part and make a half-hitch around the standing part. # Continue with another wrap inside the loop, effectively making a

round turn A turn is one round of rope on a pin or cleat, or one round of a coil. Turns can be made around various objects, through rings, or around the standing part of the rope itself or another rope. A turn also denotes a component of a knot. When the ...

around the standing part. # Complete with a half-hitch outside the loop, made in the same direction as the first two wraps, as for a clove hitch. # Dress by snugging the hitch firmly around the standing part. Load slowly and adjust as necessary.

#1857

Based on Magnus hitch #1736, this is exactly as above but with the final hitch in the opposite direction. It can be more tricky to snug-up, since both lines emerge from the same side of the hitch, but it has less tendency to twist under load. # Pass the working end around the anchor object. Bring it back alongside of the standing part and make a half-hitch around the standing part. # Continue with another wrap inside the loop, effectively making a round turn around the standing part. # Complete with a half-hitch outside the loop made in the opposite direction than the first two wraps, as for a

cow hitch The cow hitch, also called the lark's head, is a hitch knot used to attach a rope to an object. The cow hitch comprises a pair of half-hitches tied in opposing directions, as compared to the clove hitch in which the half-hitches are tied in th ...

. # Dress by snugging the hitch firmly around the standing part. Load slowly and adjust as necessary. This is the form most commonly used for aircraft tie-down. One taut-line hitch is tied 15–30 cm from the aircraft and adjusted for tension, then a second taut-line hitch is tied 5–20 cm further from the aircraft and finished with a half-hitch. Wind-induced lift tends to pull the knot tighter, gust-induced oscillations tend to damp-out, and once the half hitch is undone, pushing the lower working rope up easily releases both hitches even amid icing.

Adjusting

Once snug and set, the hitch can be adjusted as needed. To tighten the line with respect to a load attached to the standing part, the user can grasp the standing part with one hand inside of the loop and pull toward the anchor object. The hitch may be grasped with the other hand and as slack develops within the loop, the hitch slid away from the anchor object, taking up the slack and enlarging the loop. To loosen, the hitch may be slid toward the anchor object, making the loop smaller and lengthening the standing part.

Security

Although the three variations are similar, they do have distinct properties when put to use. AshleyAshley(1944), p. 298 and others suggest that #1855 is preferred as being more

secure Secure may refer to: * Security, being protected against danger or loss(es) **Physical security, security measures that are designed to deny unauthorized access to facilities, equipment, and resources **Information security, defending information ...

. Either #1856 or #1857 is also acceptable, especially if ease of adjustment is desired over security.Ashley(1944), p. 296 Ashley states #1857 has less tendency to twist. These hitches may not hold fast under all conditions, and with lines made from particularly stiff or slick modern fibers (e.g.

polypropylene Polypropylene (PP), also known as polypropene, is a thermoplastic polymer used in a wide variety of applications. It is produced via chain-growth polymerization from the monomer propylene. Polypropylene belongs to the group of polyolefins a ...

) these hitches can be difficult to make hold at all. Sometimes they can be made more secure by using additional initial wraps and finishing

es.

Friction hitches

These as a family are called Friction Hitches of hold and release to slide hitches The similar ABoK numbers are in ABoK's unique "CHAPTER 22: HITCHES TO MASTS, RIGGING AND CABLE (LENGTHWISE PULL)" 1st paragraph reads: "To withstand a lengthwise pull without slipping is about the most that can be asked of a hitch. Great care must be exercised in tying the following series of knots, and the impossible must not be expected." A Friction Hitch is on a rope column that you are grabbing with "LENGTHWISE PULL" force wise in this chapter. Not at the best (right) angle to host mount the rest of the book speaks of and shows for working hitches and thus chapter title and preface states. And so, the Friction Hitches are contained in this chapter on the errant pull angle stated as "LENGTHWISE PULL". Book shows a 'linear' Half Hitch to precede a Timber Hitch (that shows should pull at right angle to spar) so can pull LENGTHWISE in ABoK#"1733. The TIMBER HITCH AND HALF HITCH"

Killick hitch The killick hitch is a type of hitch knot used to attach a rope to oddly shaped objects. This knot is also known as the kelleg hitch. It is a combination of a timber hitch tied in conjunction with a half hitch, which is added to lend support an ...

perhaps best demonstrates the directional force effect as he shows it as the very first knot in the chapter right after the previous discussion as context . After showing the Half-Hitch preceding as only conversion for the direction adds: "The knot appears to be universal and invariable"!

References

{{Knots