Yourbestsailvideo
Stability of cruising sailboats
March 3, 2023 · 39 min · 9K views
What this video covers
Static stability in sailboats depends on the interaction between the center of gravity and the center of buoyancy, which differs fundamentally between monohulls and catamarans.Watch Monohulls rely on weight stability, where a heavy keel keeps the center of gravity below the center of buoyancy, creating a righting moment that increases as the boat heels toward 90 degrees.15:19 This design allows monohulls to maintain a positive righting arm even when heeled past 90 degrees, though they remain vulnerable to sinking if the hull is breached.18:34 Conversely, catamarans utilize form stability, providing high initial stiffness that keeps the vessel level and comfortable in moderate conditions.24:33 However, a catamaran’s righting moment decreases as it heels, reaching an unstable equilibrium at 90 degrees, which makes them prone to capsizing in extreme sea states or when hit by large beam waves.6:14 Dynamic stability analysis shows that external forces like wind gusts or breaking waves can cause a boat to heel significantly further than static calculations predict, potentially leading to a capsize if the kinetic energy exceeds the vessel's total righting energy.31:49
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