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The United States Coast Guard operated four 52-foot Motor Lifeboats (MLBs), also known as "special purpose craft — heavy weather" (SPC-HWX), from 1956 until 2021. The 52' MLBs supplemented its fleet of 227 47-foot Motor Lifeboats. [1] These motor lifeboats were built in the late 1950s and early 1960s, and each displaces 32 tons. [2]
The 52-foot Motor Lifeboat was a wooden-hulled motor lifeboat (MLB) class operated by the United States Coast Guard between 1935 and 1967 which included two ships: Invincible (CG 52300) and Triumph (CG 52301). [1] [2] [3]
A block and tackle [1] [2] or only tackle [3] is a system of two or more pulleys with a rope or cable threaded between them, usually used to lift heavy loads.. The pulleys are assembled to form blocks and then blocks are paired so that one is fixed and one moves with the load.
A test of "single" standard rope involves tying an 80 kg (176 pound) weight to the end of a length of rope. This weight is then dropped 5 meters (16½ feet) on 2.7 meters (9 feet) of rope, with the rope running over a rounded surface simulating that of a standard carabiner. This process is repeated until the rope breaks.
Running rigging is the rigging of a sailing vessel that is used for raising, lowering, shaping and controlling the sails on a sailing vessel—as opposed to the standing rigging, which supports the mast and bowsprit.
The design came about from a requirement that British motor torpedo boats should be better able to fight other small craft, which was the job of motor gun boats (MGB). To this end Vospers built on their existing 70 foot designs, and the design was trialled with MTB 379. [3] Sixteen (MTB 380-345) were ordered in 1943.