{"id":30301,"date":"2013-11-24T17:28:31","date_gmt":"2013-11-24T22:28:31","guid":{"rendered":"https:\/\/setsail.com\/?p=30301"},"modified":"2016-09-16T14:34:02","modified_gmt":"2016-09-16T19:34:02","slug":"ultimate-dinghy-revisited-is-a-big-rib-the-answer","status":"publish","type":"post","link":"https:\/\/setsail.com\/ultimate-dinghy-revisited-is-a-big-rib-the-answer\/","title":{"rendered":"Ultimate Dinghy Revisited: Is a Big RIB The Answer?"},"content":{"rendered":"<p><img loading=\"lazy\" decoding=\"async\" style=\"display: block; margin-left: auto; margin-right: auto;\" alt=\"FPB 78 RIB Concept 3 1\" src=\"https:\/\/setsail.com\/wp-content\/uploads\/2013\/11\/1FPB-78-RIB-Concept-3-1.jpg\" width=\"1000\" height=\"563\" border=\"0\" \/><\/p>\n<p>We have been rethinking the ultimate dinghy concept and are looking at a big custom designed RIB for our new FPB 78. Not having experience with properly designed deep V RIBS, we have a few questions and are hopeful the SetSail community can provide real world answers.<\/p>\n<p><!--more--><\/p>\n<p><img loading=\"lazy\" decoding=\"async\" style=\"display: block; margin-left: auto; margin-right: auto;\" alt=\"FPB 78 RIB Concept 3 4\" src=\"https:\/\/setsail.com\/wp-content\/uploads\/2013\/11\/1FPB-78-RIB-Concept-3-4.jpg\" width=\"1000\" height=\"666\" border=\"0\" \/><\/p>\n<p>This is a very rough concept sketch: to check weight, basic dimensions, and how this design might fit on the aft deck of the FPB 78. We are at 4.85m x 1.95 meters overall or 15.8&#8242; x 6.35\u2019. The hull is a constant 24 degree deadrise V-shape.<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" style=\"display: block; margin-left: auto; margin-right: auto;\" alt=\"FPB 78 RIB Concept 3 2\" src=\"https:\/\/setsail.com\/wp-content\/uploads\/2013\/11\/1FPB-78-RIB-Concept-3-2.jpg\" width=\"1000\" height=\"563\" border=\"0\" \/><\/p>\n<p>This dink has three jobs: a shore boat where there are docks at which to disembark, for exploration far from the mother ship, and as a primary escape vehicle instead of a life raft. As such we are interested in comfort, which means ride and dryness, and seakeeping in sub-optimal sea states. The ability to maintain good turn of speed in chop also has value.<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" style=\"display: block; margin-left: auto; margin-right: auto;\" alt=\"FPB 78 RIB Concept 3 3\" src=\"https:\/\/setsail.com\/wp-content\/uploads\/2013\/11\/1FPB-78-RIB-Concept-3-3.jpg\" width=\"1000\" height=\"563\" border=\"0\" \/><\/p>\n<p>We are looking at a displacement of around 800\/900 pounds (360\/410 kgs) rigged, but not including passengers.<\/p>\n<p>Now some questions:<\/p>\n<ul>\n<li>How does a RIB like this compare in terms of seakeeping to a more traditional flatter bottom dinghy?<\/li>\n<li>Is it drier or wetter in chop?<\/li>\n<li>What about beam to length proportions? We are 2.5\/1. Narrow by dinghy standards, but a little chubby by the criteria of big rescue RIBs.<\/li>\n<li>Any projections on performance and fuel burn with a pair \u00a0of 20\/30 HP two stroke outboards?<\/li>\n<li>We have assumed 4mm\/3\/16\u201d bottom plate, 1\/8\u201d\/3mm deck, same for frames at 12\u201d\/300mm on center, with 6mm1\/4\u201d transom + local stiffeners in our weight budget. We want to be fault tolerant. How do these scantlings sound?<\/li>\n<li>Suggestions for tube construction details, materials, what to look for and what to avoid, and vendors are solicited.<\/li>\n<li>Tube diameter? We are showing here 450mm\/18\u201d. Sufficient or should it be larger?<\/li>\n<li>Tube clearance from waterline at rest, with two crew aboard, and when heavy?<\/li>\n<li>Deadrise angles forward and aft?<\/li>\n<li>Other details on rigging, store, etc are always welcome.<\/li>\n<\/ul>\n","protected":false},"excerpt":{"rendered":"<p>We have been rethinking the ultimate dinghy concept and are looking at a big custom designed RIB for our new <a class=\"read-more\" href=\"https:\/\/setsail.com\/ultimate-dinghy-revisited-is-a-big-rib-the-answer\/\">&#8230;Read More<\/a><\/p>\n","protected":false},"author":3,"featured_media":30312,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[4,178,248],"tags":[],"class_list":["post-30301","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-dashew-blog","category-four","category-logs"],"_links":{"self":[{"href":"https:\/\/setsail.com\/wp-json\/wp\/v2\/posts\/30301"}],"collection":[{"href":"https:\/\/setsail.com\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/setsail.com\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/setsail.com\/wp-json\/wp\/v2\/users\/3"}],"replies":[{"embeddable":true,"href":"https:\/\/setsail.com\/wp-json\/wp\/v2\/comments?post=30301"}],"version-history":[{"count":9,"href":"https:\/\/setsail.com\/wp-json\/wp\/v2\/posts\/30301\/revisions"}],"predecessor-version":[{"id":30311,"href":"https:\/\/setsail.com\/wp-json\/wp\/v2\/posts\/30301\/revisions\/30311"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/setsail.com\/wp-json\/wp\/v2\/media\/30312"}],"wp:attachment":[{"href":"https:\/\/setsail.com\/wp-json\/wp\/v2\/media?parent=30301"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/setsail.com\/wp-json\/wp\/v2\/categories?post=30301"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/setsail.com\/wp-json\/wp\/v2\/tags?post=30301"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}