Sven Yrvind · video

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Sven Yrvind addresses whether leeboards require ballast, arguing the answer depends on hull geometry rather than a fixed rule.0:03 He explains the EU recreational boating directive requires self-righting to 120 degrees, then walks through a stability curve: maximum positive stability at 60 degrees, capsize at 120 degrees, maximum negative stability beyond that.0:25 His core argument is that slender hulls — where height approximates beam — maintain a favorable center of gravity without outside ballast, making the positive stability area under the curve twice the negative area.1:31 He cites his own boats, including Matladen and Paradox, as ballast-free examples.1:25 A physical demonstration with a round object and screws shows that a hull can self-right even inverted when the geometry is right.1:31 He also announces an appearance at the Båtshow in Stockholm, Älvsjö, on the following Thursday at 4 o'clock, where he will take questions in person.2:24 Hull slenderness, not ballast alone, determines whether a boat achieves a safe self-righting range.

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