{"id":2352,"date":"2020-01-27T08:06:52","date_gmt":"2020-01-27T16:06:52","guid":{"rendered":"http:\/\/tradewindssailing.com\/wordpress\/?p=2352"},"modified":"2020-01-27T08:08:27","modified_gmt":"2020-01-27T16:08:27","slug":"nautical-terminator-tonnage-part-1","status":"publish","type":"post","link":"https:\/\/www.tradewindssailing.com\/wordpress\/nautical-terminator\/nautical-terminator-tonnage-part-1\/","title":{"rendered":"Nautical Terminator – Tonnage (Part 1)"},"content":{"rendered":"\n
\"\"<\/figure>\n\n\n\n

          If you\nlike getting frustrated, and who doesn\u2019t, you could do no better than trying to\nunderstand the nautical terms associated with tonnage. We have long tons, short\ntons, avoirdupois tons, imperial tons,\ngross register tons, gross tons, net register tons, net tons, deadweight tons, metric\ntons, tonnes, tuns, and just tons and tons of fun.<\/p>\n\n\n\n

          There are three concepts here which are vaguely related,\nand by distinguishing these we can eliminate a whole lot of confusion, but not\nall. <\/p>\n\n\n\n

          The first is the idea of displacement<\/em>, a measurement\nof weight. According to tradition, this was discovered by Archimedes in\nhis bathtub. It\u2019s the weight of the water displaced when you put something in\nit. Imagine placing a floating box in a tub of water filled to the brim. The\nweight of the resultant spilled water is the displacement<\/em> of the vessel\nin question. Since the box is hollow we are only measuring the weight of the\nempty box. In ships this is expressed in long tons, which equal 2,240 pounds,\nor the nearly equivalent metric tons (tonnes), which equal 1000 kilograms or 2204.6\npounds. <\/p>\n\n\n\n

          The second idea is deadweight tonnage<\/em> or DWT<\/em>,\nanother measure of weight. This is the weight of just the cargo, or\nalternatively, the maximum carrying capacity of the ship. It is expressed in long\ntons or metric tons. Adding cargo to our box above increases the total\ndisplacement, and will immerse it lower in the water. How much cargo a boat can\ncarry by weight is a safety issue; we don\u2019t want it to sink. But how much it\ncan carry by volume is an issue for the tax man. So we have\u2026.<\/p>\n\n\n\n

          The third concept, which is gross register tonnage (or\nGRT)<\/em>, a measurement of volume. Two vessels of the same displacement\nmay have different internal volumes if one is made from carbon fiber and\nanother made of steel. It is the internal volume, not the displacement, that is\nused to calculate taxes and fees. This volume is confusingly expressed as \u201cregister\ntons,\u201d even though it is not a measurement of weight. A register ton is equal\nto 100 cubic feet. But to measure the functional capacity of the ship, we need\nto subtract tanks, engines, crew space, and any other space not usable for\ncargo. The result is net register tonnage (or NRT)<\/em>, also measured in register\ntons. <\/p>\n\n\n\n

          More next time on tonnage.<\/p>\n","protected":false},"excerpt":{"rendered":"

          If you like getting frustrated, and who doesn\u2019t, you could do no better than trying to understand the nautical terms associated with tonnage. We have long tons, short tons, avoirdupois tons, imperial tons, gross register tons, gross tons, net … Continue reading →<\/span><\/a><\/p>\n","protected":false},"author":13,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_jetpack_memberships_contains_paid_content":false,"footnotes":"","jetpack_publicize_message":"","jetpack_publicize_feature_enabled":true,"jetpack_social_post_already_shared":true,"jetpack_social_options":{"image_generator_settings":{"template":"highway","default_image_id":0,"font":"","enabled":false},"version":2}},"categories":[31],"tags":[],"class_list":["post-2352","post","type-post","status-publish","format-standard","hentry","category-nautical-terminator"],"jetpack_publicize_connections":[],"jetpack_featured_media_url":"","jetpack_likes_enabled":true,"jetpack_sharing_enabled":true,"_links":{"self":[{"href":"https:\/\/www.tradewindssailing.com\/wordpress\/wp-json\/wp\/v2\/posts\/2352","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.tradewindssailing.com\/wordpress\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.tradewindssailing.com\/wordpress\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.tradewindssailing.com\/wordpress\/wp-json\/wp\/v2\/users\/13"}],"replies":[{"embeddable":true,"href":"https:\/\/www.tradewindssailing.com\/wordpress\/wp-json\/wp\/v2\/comments?post=2352"}],"version-history":[{"count":2,"href":"https:\/\/www.tradewindssailing.com\/wordpress\/wp-json\/wp\/v2\/posts\/2352\/revisions"}],"predecessor-version":[{"id":2428,"href":"https:\/\/www.tradewindssailing.com\/wordpress\/wp-json\/wp\/v2\/posts\/2352\/revisions\/2428"}],"wp:attachment":[{"href":"https:\/\/www.tradewindssailing.com\/wordpress\/wp-json\/wp\/v2\/media?parent=2352"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.tradewindssailing.com\/wordpress\/wp-json\/wp\/v2\/categories?post=2352"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.tradewindssailing.com\/wordpress\/wp-json\/wp\/v2\/tags?post=2352"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}