Maintaining equilibrium is one of the great challenges in turbulent times or seas. One of the essential calculations for any naval architect is that of stability, or the ability of a vessel to return to equilibrium following a disturbance. While the challenge has been around since the first human sat up on a floating log and then rolled over, our ability to quantify the inputs and calculate metacentric heights and restoring moments was initiated in the late 1700s.
Despite having the knowhow to predict and manage stability and keep boats on a safe and even keel for upwards of 250 years, we still see failures in new vessels in 2026. The tragic sinking of the 184′ (56m) sloop Bayesian at anchor during a squall in August 2024, and the September 2025 capsize and sinking of the 24m (79′) Turkish-built yacht Dolce Vento immediately after her launch are reminders that even the most lavish and expensive yachts are not immune to flawed stability calculations. Sadly, such failures are completely avoidable if longstanding sound stability management practices are applied.
With that in mind, regular contributor and experienced naval architect Patrick Bray has furnished us with a primer on vessel stability, a reminder of the time-tested core skills that keep modern boats upright and capable of navigating the most perilous waters.