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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

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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′ x 6.35\u2019. The hull is a constant 24 degree deadrise V-shape.<\/p>\n

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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

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We are looking at a displacement of around 800\/900 pounds (360\/410 kgs) rigged, but not including passengers.<\/p>\n

Now some questions:<\/p>\n

\n
• How does a RIB like this compare in terms of seakeeping to a more traditional flatter bottom dinghy?<\/li>\n
• Is it drier or wetter in chop?<\/li>\n
• 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
• Any projections on performance and fuel burn with a pair \u00a0of 20\/30 HP two stroke outboards?<\/li>\n
• 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
• Suggestions for tube construction details, materials, what to look for and what to avoid, and vendors are solicited.<\/li>\n
• Tube diameter? We are showing here 450mm\/18\u201d. Sufficient or should it be larger?<\/li>\n
• Tube clearance from waterline at rest, with two crew aboard, and when heavy?<\/li>\n
• Deadrise angles forward and aft?<\/li>\n
• Other details on rigging, store, etc are always welcome.<\/li>\n<\/ul>\n","protected":false},"excerpt":{"rendered":"

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