{"id":410,"date":"2020-12-14T05:42:27","date_gmt":"2020-12-14T05:42:27","guid":{"rendered":"https:\/\/maritimesa.org\/nautical-science-grade-10\/?p=410"},"modified":"2020-12-14T05:42:27","modified_gmt":"2020-12-14T05:42:27","slug":"ropes-and-their-usage-construction-of-ropes","status":"publish","type":"post","link":"https:\/\/maritimesa.org\/nautical-science-grade-10\/2020\/12\/14\/ropes-and-their-usage-construction-of-ropes\/","title":{"rendered":"Ropes and their usage: Construction of ropes"},"content":{"rendered":"

The collective term used for all types of rope, twine and lines is cordage.\u00a0 Unlike the past when rope was measured by its circumference, \u00a0it is now measured across its diameter.\u00a0\u00a0 It is made either from vegetable or man-made fibres.\u00a0 The fibres are twisted together to form yarns, which are then twisted together in the opposite direction to form strands.\u00a0 Three or more strands are then laid up again, but in the opposite direction to form rope.
\n

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Hawser laid rope.<\/p><\/div>
\nLay of ropes.<\/strong>
\nWhen three strands are used, the rope is referred to as \u201chawser laid\u201d. If four strands are used it is referred to as \u201cshroud laid\u201d. If three hawser laid ropes are twisted together (in the opposite direction to their strands) it is referred to as a \u201ccable laid\u201c rope.
\n

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Shroud laid rope.<\/p><\/div>
\n

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Cable laid rope.<\/p><\/div>
\nWhen the twist of the strands is to the right, it is called a \u201cright hand lay\u201d. If it is to the left then it is called a \u201cleft hand lay\u201d.
\n

\"\"

Lay of ropes.<\/p><\/div>
\nBraided ropes.<\/strong>
\nBesides the above three types of lay, there are also \u201cbraided\u201d ropes. They comprise three types, namely diamond braid with a core, diamond without a core (called a hollow braid and a solid braid.
\nThe first and last of the three (diamond with a core and solid braid) cannot be spliced whilst the hollow braid can.
\n

\"\"

Plaited rope.<\/p><\/div>
\nThe plaited or eight stranded rope is made up of pairs of braided strands and is mostly used for mooring lines and other general purposes. It is as strong as three stranded rope and wears very well.<\/p>\n

Small diameter cordage.<\/strong><\/p>\n

    \n
  • A bolt rope is made of Italian hemp soft laid and is used for roping the edges of sails and awnings.<\/li>\n
  • Signal halyards are usually made of soft, white hemp. It is very flexible.<\/li>\n
  • Log line is plaited or round sennit.<\/li>\n
  • Twine is made of hemp or flax and is used for seaming.<\/li>\n
  • Spun yarn is used for all general purposes and can be tarred if required.<\/li>\n
  • Oakum consists of old condemned cordage which has been picked apart and is used for caulking wooden decks. In times gone by, picking oakum was used as a punishment.<\/li>\n<\/ul>\n

    Ropes constructed of man-made fibresare made up in the same way, and they are often plaited as well. Plaiting a rope distributes the wear more evenly over the surface of the rope. Ropes made of man-made fibres are more expensive than the natural ropes but they last much longer. The more strands there are in a rope, the more flexible it will be. <\/p>\n","protected":false},"excerpt":{"rendered":"

    The collective term used for all types of rope, twine and lines is cordage.\u00a0 Unlike the past when rope was measured by its circumference, \u00a0it is now measured across its diameter.\u00a0\u00a0 It is made either from vegetable or man-made fibres.\u00a0 The fibres are twisted together to form yarns, which are […]<\/p>\n","protected":false},"author":6,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[51,67,68],"tags":[],"class_list":["post-410","post","type-post","status-publish","format-standard","hentry","category-10-2-seamanship","category-10-2-4-ropes-and-their-usage","category-10-2-4-1-construction-of-ropes"],"_links":{"self":[{"href":"https:\/\/maritimesa.org\/nautical-science-grade-10\/wp-json\/wp\/v2\/posts\/410"}],"collection":[{"href":"https:\/\/maritimesa.org\/nautical-science-grade-10\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/maritimesa.org\/nautical-science-grade-10\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/maritimesa.org\/nautical-science-grade-10\/wp-json\/wp\/v2\/users\/6"}],"replies":[{"embeddable":true,"href":"https:\/\/maritimesa.org\/nautical-science-grade-10\/wp-json\/wp\/v2\/comments?post=410"}],"version-history":[{"count":2,"href":"https:\/\/maritimesa.org\/nautical-science-grade-10\/wp-json\/wp\/v2\/posts\/410\/revisions"}],"predecessor-version":[{"id":412,"href":"https:\/\/maritimesa.org\/nautical-science-grade-10\/wp-json\/wp\/v2\/posts\/410\/revisions\/412"}],"wp:attachment":[{"href":"https:\/\/maritimesa.org\/nautical-science-grade-10\/wp-json\/wp\/v2\/media?parent=410"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/maritimesa.org\/nautical-science-grade-10\/wp-json\/wp\/v2\/categories?post=410"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/maritimesa.org\/nautical-science-grade-10\/wp-json\/wp\/v2\/tags?post=410"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}