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Because the pads of the liftboat are sitting on a muddy, unstable seafloor, most liftboats practice a safety measure called a preload, where the boat jacks-up the absolute minimum to clear hull from the tips of the significant wave heights, [3] fills its holds with water for weight and allows the boat to settle in the mud for several hours ...
USS Kearsarge (BB-5), was a pre-dreadnought battleship of the United States Navy and lead ship of her class of battleships.She was named after the sloop-of-war Kearsarge, famous for sinking the CSS Alabama, and was the only United States Navy battleship not named after a state.
A long narrow centreboard produces less drag than a short, wide one for a given amount of lift, resulting in a faster boat that can point closer into the wind. A fore and aft, pivoting centreboard can also be used to move the centre of lateral resistance aft to match a change in sail plan, such as furling or dropping the jib.
Personnel transfer from USS Rankin by highline, a form of jackstay, 1960.. A jackstay is a cable or bar between two points to support and guide a load between those points, or as an anchor to attach something to be constrained along that line.
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Geheyan dam boat lift, also in Hubei Province, capable of lifting vessels of 300 tons displacement. The dam was completed in 1994, but technical difficulties delayed the opening of the ship lift for four more years. Longtan dam boat lift, capacity to lift vessels of 250 tons, in a basin 40×10.8×1.8 meters, and a vertical lift of 68.5 meters. [2]
The hull is actually a water-tight barge that floats on the water’s surface. When the rig reaches the work site, the crew jacks the legs downward through the water and into the sea floor (or onto the sea floor with mat supported jackups). This anchors the rig and holds the hull well above the waves. [citation needed]
Centring [1], centre [2], centering [3] [4], or center [5] is a type of falsework: the temporary structure upon which the stones of an arch or vault are laid during construction. Until the keystone is inserted an arch has no strength and needs the centring to keep the voussoirs in their correct relative positions.
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