Beam. The beam of the boat is its width measured at the widest point, usually a little aft of midships. As the hull tapers to a thin vee at the bow, and narrows at the stern, the beam is often located around midships.

A beam is also a major structural member on a boat, running transversely across the boat and forming a rigid assembly to maintain the shape and structural rigidity of the vessel. The beam may be made of fibreglass, composite materials such as carbon-fibre or kevlar, steel or aluminum, wood, or any combination of these.

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