Sven Yrvind · video

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Sven Yrvind details the design of his small boat’s lateral plane, which features one daggerboard, two bilgeboards, and a spade rudder.0:09 He emphasizes that small boats require different design principles than large vessels, citing the square-cube law to explain why scaling up components like rudders or decks is ineffective.7:06 The rudder utilizes a 50-millimeter diameter bronze axis with five-millimeter wall thickness, designed to support the boat's weight when it dries out on the bottom.6:07 To ensure stability and prevent the boat from remaining inverted in a capsize, Yrvind incorporates significant buoyancy at the top of the hull.3:51 He describes his use of a forward-positioned dihedral sail to maintain directional stability in heavy weather, a technique he refined during a 1989 passage from Ireland to Newfoundland in a 15-foot boat.2:17 Access to the daggerboards and forward gear is provided through internal hatches, allowing for maintenance and adjustment from inside the cabin.4:37

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