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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.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

en.wikipedia.org/wiki/Narrowboat

A narrowboat is a boat (or barge) of a particular design, made to fit the narrow canal locks of the United Kingdom.The canal system were the UK's "motorways" of the Industrial Revolution, but with the advent of the railways commercial canal traffic gradually diminished and the last regular long-distance traffic disappeared in 1970.However, some commercial traffic continued into the 1...

jonboataccessories.com/tips-tricks-articles/different-jon-boat-sizes

There are different Jon Boat sizes to accommodate many different uses. It’s important to have the correct size boat for your intended use (i.e fishing, duck hunting) and the size of the body of water you’ll be floating it on. Jon Boat Sizes. Jon Boats typically range from as little as 8 feet all the way up to over 20 feet.

www.boatliftcradle.com

Boat lift cradle beams standard and custom sizes. Boat Lift Cradle Beams - - Free Freight Shipping! Available Cradle Beam Sizes. Cradle Beams With Cable Tie Off Eye: 4" x 9' Bottom Beams 3,000lb Max Per Pair : 5" x 8' Bottom Beams 6,000lb Max Per Pair ... Custom Boat Lift Cradle Sizes Available!

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

Beam is important in determining the handling characteristics of a ship design. A narrow beam hull will run fast but will not perform well in heavy waves because of the narrow cross section. A hull which has a wider beam will be less efficient in cutting through the water because of the larger mass of water that is being displaced.

boatliftworld.com/boat-lift-cradle-beams.html

Beams are Hot Dipped Galvanized. Cradle must be 1 ft. longer (minimum) than width of boat: Boat slip needs to be a minimum of 1 ft. wider than length of cradle. Example: Boat 8' wide, minimum cradle 9' & boat slip 10ft. wide. FREE SHIPPING ON THIS ITEM

www.quora.com/When-buying-a-boat-what-does-a-54-beam-mean

It means that the widest point of the boat is 54 inches from side to side. The beam is the width of a vessel, and the measurement given is always the widest distance. This is important for knowing what you can fit your vessel through, what size s...

www.iqboatlifts.com/how-to-choose-the-correct-capacity-boat-lift-for-your-boat

When it comes to choosing a lift for your boat, pontoon or PWC, there are a few things you will need to know to ensure you purchase a lift that is the proper size for your watercraft. Knowing the overall weight and beam of your boat is the best place to start. This will allow you to choose the correct weight capacity and the correct cradle width.

forums.iboats.com/.../603603-beam-width-how-tight-can-i-squeeze

Re: Beam Width? How tight can I squeeze? I think you will be fine with 8' 6". Most boats have rub rails that let you bump against stuff without damaging the boat. You should closely inspect the slip to ensure that the only thing touching will be the rub rails though.