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Taut-line hitch: Difference between revisions
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The '''Taut-line hitch''' is an adjustable [[Loop (knot)|loop knot]] for use on lines under [[Tension (mechanics)|tension]]. 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]] around the standing part after passing around an anchor object. Tension is maintained by sliding the hitch to adjust size of the loop, thus changing the effective length of the standing part without retying the knot. | The '''Taut-line hitch''' is an adjustable [[Loop (knot)|loop knot]] for use on lines under [[Tension (mechanics)|tension]]. 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]] around the standing part after passing around an anchor object. Tension is maintained by sliding the hitch to adjust 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]], by [[arborists]] when climbing trees,<ref name="sonhitch">Mark Adams, ''Son of a Hitch: A Genealogy of Arborists' Climbing Hitches''. http://www.treebuzz.com/pdf/0505_geneology.pdf</ref> for creating adjustable [[mooring]]s in | It is typically used for securing [[tent]] lines in outdoor activities involving [[camping]], by [[arborists]] when climbing trees,<ref name="sonhitch">Mark Adams, ''Son of a Hitch: A Genealogy of Arborists' Climbing Hitches''. http://www.treebuzz.com/pdf/0505_geneology.pdf</ref> for creating adjustable [[mooring]]s in tidal areas,<ref name="tossrigg">Brion Toss, ''The Complete Rigger's Apprentice'' (Camden: International Marine, 1998), 54-55.</ref> and to secure loads on vehicles. A versatile knot, the Taut-line hitch was even used by [[astronauts]] during [[STS-82|the second mission]] to repair the [[Hubble Space Telescope]].<ref name="hubble">Tom Nugent, "Blanketing the Hubble", ''University of Delaware Messenger'', vol. 6, no.3 (1997) http://www.udel.edu/PR/Messenger/97/3/BLANKET.html</ref> | ||
==Naming== | == Naming == | ||
[[Image:AdjustableHitchVariations.jpg|thumb|'''Top''', left to light: [[ABOK]] "Rolling Hitch(1)" (#1734), "Rolling Hitch(2)" (#1735), "Magnus Hitch" (#1736). '''Bottom''', the corresponding adjustable loop made using the hitch above it, left to right: "Adjustable Hitch" (#1800), "Midshipman's Hitch" (#1799), "Adjustable Hitch" (#1800) with the concluding hitch reversed.]] | [[Image:AdjustableHitchVariations.jpg|thumb|'''Top''', left to light: [[ABOK]] "Rolling Hitch(1)" (#1734), "Rolling Hitch(2)" (#1735), "Magnus Hitch" (#1736). '''Bottom''', the corresponding adjustable loop made using the hitch above it, left to right: "Adjustable Hitch" (#1800), "Midshipman's Hitch" (#1799), "Adjustable Hitch" (#1800) with the concluding hitch reversed.]] | ||
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== Tying == | == Tying == | ||
=== #1799 === | === #1799 === | ||
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. | 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. | ||
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#Dress by snugging the hitch firmly around the standing part. Load slowly and adjust as necessary. | #Dress by snugging the hitch firmly around the standing part. Load slowly and adjust as necessary. | ||
==Adjusting== | == 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, grasp the standing part with one hand inside of the loop and pull towards the anchor object. Grasp the hitch with the other hand and as slack develops within the loop slide the hitch away from the anchor object, taking up the slack and enlarging the loop. To loosen, slide hitch toward the anchor object, making the loop smaller and lengthening the standing part. | 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, grasp the standing part with one hand inside of the loop and pull towards the anchor object. Grasp the hitch with the other hand and as slack develops within the loop slide the hitch away from the anchor object, taking up the slack and enlarging the loop. To loosen, slide hitch toward the anchor object, making the loop smaller and lengthening the standing part. | ||
==Security== | == Security == | ||
Although the three variations are similar they do have distinct properties when put to use. Ashley<ref name="ashley298">Ashley, 298.</ref> and others<ref name="tossrigg"/><ref name="trower">Nola Trower, ''Helmsman Guides: Knots and Ropework'' (Wiltshire: Helmsman Books, 1995), 31-32.</ref><ref>Animated Knots by Grog. ''Rolling Hitch''. http://www.animatedknots.com/rollinghitchboating/</ref> suggest that #1799 is preferred as being more [[Knot#Security|secure]]. Either variant of #1800 is also acceptable, especially if ease of adjustment is desired over security.<ref name="tossguide">Brion Toss, ''Chapman's Nautical Guides: Knots'' (New York: Hearst Marine Books, 1990), 30-32.</ref> Ashley states the version of #1800 with the reversed concluding hitch has less tendency to twist.<ref name="ashley304"/> | Although the three variations are similar they do have distinct properties when put to use. Ashley<ref name="ashley298">Ashley, 298.</ref> and others<ref name="tossrigg"/><ref name="trower">Nola Trower, ''Helmsman Guides: Knots and Ropework'' (Wiltshire: Helmsman Books, 1995), 31-32.</ref><ref>Animated Knots by Grog. ''Rolling Hitch''. http://www.animatedknots.com/rollinghitchboating/</ref> suggest that #1799 is preferred as being more [[Knot#Security|secure]]. Either variant of #1800 is also acceptable, especially if ease of adjustment is desired over security.<ref name="tossguide">Brion Toss, ''Chapman's Nautical Guides: Knots'' (New York: Hearst Marine Books, 1990), 30-32.</ref> Ashley states the version of #1800 with the reversed concluding hitch has less tendency to twist.<ref name="ashley304"/> | ||
These hitches should not be depended on to hold fast under all conditions. With some particularly stiff or slick modern fibers (especially [[Polypropylene|Polypropylene commonly called 'poly']] based lines) they can be difficult to make hold at all. Sometimes it can be made more secure by using additional initial wraps and finishing [[half-hitch | These hitches should not be depended on to hold fast under all conditions. With some particularly stiff or slick modern fibers (especially [[Polypropylene|Polypropylene commonly called 'poly']] based lines) they can be difficult to make hold at all. Sometimes it can be made more secure by using additional initial wraps and finishing [[half-hitch]]es.<ref name="tossguide"/> If even more security is needed the [[Trucker's hitch]] is quite robust and can be used to produce significantly more tension if required, albeit at the expense of quick adjustability. | ||
== See also == | == See also == | ||
* [[List of knots]] | * [[List of knots]] | ||
==References== | == References == | ||
{{reflist}} | {{reflist}} | ||
==External links== | == External links == | ||
*[http://www.animatedknots.com/rollinghitchboating/|Animated Knots by Grog. ''Rolling Hitch''] | *[http://www.animatedknots.com/rollinghitchboating/|Animated Knots by Grog. ''Rolling Hitch''] | ||