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The boat's hull and superstructure are constructed entirely from 5456 marine grade aluminum. [3] Designed with a hard chined deep "V" planing hull, [8] the 47′ MLB exceeds its hull speed. The frame is composed of 17 vertical bulkhead frames, each of which is welded to the deck and hull, and five of which are watertight. [8]
The series was made of welded aluminum. Most Marinettes today are used on inland rivers and lakes, although some are found in saltwater locations. They are, due to their light weight, relatively shallow chine angle, flat transom and broad beam, relatively fast and economical for boats of their size.
[9] [5] During the first half of the twentieth century, substantial studies were conducted into the corrosion qualities of various lightweight aluminium alloys for aviation purposes. [10] The first aircraft to be constructed from Alclad was the all-metal US Navy airship ZMC-2 , which was constructed in 1927 at Naval Air Station Grosse Ile . [ 2 ]
Aluminum and aluminum alloys are used both in sheet form for all-metal hulls or for isolated structural members. Many sailing spars are frequently made of aluminium after 1960. It is the lightest material for building large boats (being 15–20% lighter than polyester and 30% lighter than steel).
In wooden shipbuilding, each frame is composed of several sections, so that the grain of the wood can follow the curve of the frame. Starting from the keel, these are the floor (which crosses the keel and joins the frame to the keel), the first futtock , the second futtock , the top timber , and the rail stanchion . [ 1 ]
Aluminum's strength-to-weight ratio exceeds that of steel, so Aluminaut 's 6.5-inch-thick (170 mm) shell could withstand pressures of 7,500 pounds per square inch (52 MPa) at the sub's 17,000 ft (5,200 m) maximum diving range. [3] The Aluminaut was designed at the Woods Hole Oceanographic Institution in Woods Hole, Massachusetts. A full-scale ...
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