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Sven Yrvind, 87 years old, analyzes whether his 2.5-meter mast will survive a capsize near Cape Horn on his small ocean cruiser.▶ 1:11 The core argument is mathematical: a standard 45-foot cruising boat carries a 20-meter mast, roughly eight times longer than his.▶ 1:39 Because water hardness scales with the square of speed, and mast-tip speed scales with mast length, the force a capsizing mast strikes water with grows by a factor of 64 in force and 512 in bending moment compared to his short rig.▶ 2:35 His mast is shorter than half the boat's length, so it enters the water slowly and softly.▶ 5:03 He also demonstrates that longer objects break more easily — snapping a short match is trivial, but breaking it in four pieces is not — and applies the same logic to mast survival.▶ 3:31 Alongside the mast analysis, he installs a small ventilation hatch with a retaining string to allow airflow in rain without flooding, and epoxies a handhold inside the forward hatch as a storm anchor point to keep himself secured during a capsize.▶ 7:45 Short masts survive capsize because low tip speed keeps water-impact forces manageable.▶ 10:20

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