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Beam (nautical)
From Wikipedia, the free encyclopedia
The beam of a ship is its width at the widest point, or at the mid-point of its length. Generally speaking, the wider a ship (or boat)'s beam, the more initial stability it will have, at expense of reserve stability in the event of a capsize, where more energy is required to right the vessel from its inverted position. Typical length-to-beam ratios for small sailboats are from 2:1 (dinghies to trailerable sailboats around 20') to 5:1 (racing sailboats over 30'). Large ships have widely varying beam ratios, some as large as 20:1. Rowing shells designed for flatwater racing may have length to beam ratios as high as 30:1 [1], while a coracle has a ratio of almost 1:1 - it is nearly circular.
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