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en.wikipedia.org/wiki/Beam_(nautical)

The beam of a ship is its width at the widest point as measured at the ship's nominal waterline.The beam is a bearing projected at right-angles from the fore and aft line, outwards from the widest part of ship. Beam may also be used to define the maximum width of a ship's hull, or maximum width including superstructure overhangs.

www.iboats.com/boat-covers/how-measure-your-boats-beam-length

The beam of your boat is the width at the widest part of the boat. To measure the beam, stand inside the boat and run a measuring tape from the port (left) side to the starboard (right) side at the widest section of your boat. You can also look up your boat's beam by using our Boat Manufacturer Reference Guide

www.boatdesign.net/threads/beam-to-length-ratio.6606

To answer CT's question, boats are paid for primarily by length--purchase price, taxes, insurance, marina fees, etc. Therefore, if you can pack more accommodation into the boat for a given length (at otherwise constant ownership cost), the depth and beam have to be larger.

www.reference.com/vehicles/beam-measurement-boats-ae98df4...

The beam of a boat is the measurement of its width at its widest point. Many ship designs have a constant beam measurement that runs most of the length of the vessel, while others may have a more pronounced taper.

www.thoughtco.com/measuring-a-vessels-beam-2292976

Beam can also be measured at specific points on the hull like the pilot house or cargo area but these measurements will be designated with the names of these structures. The main measurement of beam is taken at the widest point of a vessel.

downeastboatforum.com/threads/beam-size-to-boat-length.11393

It really depends on the boat being designed: Typical values[edit]Typical length-to-beam ratios for small sailboats are from 2:1 (dinghies to trailerable sailboats around 20 ft or 6 m) to 5:1 (racing sailboats over 30 ft or 10 m).

www.marine.marsh-design.com/content/length-beam-ratio

Definition L/B = length divided by beam. Units: Dimensionless. Usually, the waterline dimensions LWL and BWL are used for monohulls, or for a single hull of a multihull. What it's used for Performance Larger L/B indicates a slimmer hull. This usually implies less wave-making resistance, and thus more efficient high-speed performance, but also suggests reduced load-carrying

www.boatingmag.com/how-to-choose-best-riding-boat

Gerr said the length-to-beam ratio is a dead giveaway. A Ride Like a Boat’s You often hear owners of big, bulky (typically classic) cars saying their car “rides like a boat.” Usually this means the car has a squishy suspension and a lumbering turning radius. ... How to Choose the Best-Riding Boat. Boating Magazine. He provided a wakeboard ...

www.docksidereports.com/boat_specifications.htm

Thus, if you have a boat that is 50 feet on deck and 46 feet on waterline, the registered length will be 48 feet. The same holds true for the beam of the boat; it's an average between the widest point and the beam at water line. Tonnage

goneoutdoors.com/determine-beam-boat-4474021.html

The widest part of a boat's width is its beam. Measuring the beam is a two-step process, because you must find your boat's centerline and make the measurement perpendicular to the centerline. All you need is a ball of twine, a carpenter's square, some duct tape and a measuring tape.