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Sven Yrvind constructs the second of two twin keels for his boat using 50 mm thick Divinycell foam with a density of 80 kg/m³.▶ 1:30 This second keel features improved hole distribution and a more even surface finish compared to the first unit.▶ 0:16 The design requires the keels to lean outward at a 20-degree angle to minimize hydrodynamic interference and reduce resistance between the two foils.▶ 2:17 The installation plan also incorporates a 1% toe-in alignment, which necessitates precise shaping of the matching surface where the keels meet the hull.▶ 2:43 The construction process involves layering the foam core, which will cure overnight before further shaping.▶ 1:32 Proper alignment and surface matching remain the primary challenges for integrating the twin keels into the hull structure.▶ 2:09

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