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A level-luffing crane is a crane mechanism where the hook remains at the same level while luffing: moving the jib up and down, so as to move the hook inwards and outwards relative to the base. [ 1 ] Usually the description is only applied to those with a luffing jib that have some additional mechanism applied to keep the hook level when luffing.
Although its exact nature is unclear, the accounts of ancient historians seem to describe it as a sort of crane equipped with a grappling hook that was able to drop and partly submerge an attacking ship down into the water, then either cause the ship to capsize or suddenly let it go altogether. It was dropped onto enemy ships, which would then ...
As cranes became more common in docks, and as ships became bigger, they also became more specialised. In 1927, Stothert & Pitt produced the first bulk-handling crane . [ 3 ] Rather than a simple hook that could handle a range of slung loads, this was a crane designed around the use of an integral grab.
The Hammerhead crane at the PSNS & IMF in Bremerton in April. The shipyard is planning for a major renovation and modernization known as SIOP, which will span years, and recently put out a request ...
Small Titan or hammerhead crane. The ultimate development of the dedicated block-setting crane was the hammerhead or 'giant cantilever' Titan crane. These had a deep double truss as a cantilever beam atop a large diameter roller bearing, on a carriage similar to that of the Hercules. The upper edges of the two trusses formed a set of rails for ...
Given the challenges of successfully employing anti-ship ballistic missiles in general—and the challenges of attacking a U.S. Navy destroyer in particular—a failed attack wouldn’t be surprising.
A crane vessel, crane ship, crane barge, or floating crane is a ship with a crane specialized in lifting heavy loads, typically exceeding 1,500 t (1,476 long tons; 1,653 short tons) for modern ships. The largest crane vessels are used for offshore construction. [1] The cranes are fitted to conventional monohulls and barges, but the largest ...
This specific example uses a level luffing mechanism to maintain the load at approximately the same vertical height as the jib moves through its range of travel. A jib or jib arm is the horizontal or near-horizontal beam used in many types of crane to support the load clear of the main support. [1] [2] An archaic spelling is gib. [3]