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A slipway, also known as boat ramp or launch or boat deployer, is a ramp on the shore by which ships or boats can be moved to and from the water. They are used for building and repairing ships and boats, and for launching and retrieving small boats on trailers towed by automobiles and flying boats on their undercarriage .
An air winch, sometimes known as an air hoist or air tugger, is an air-powered version of a winch. It is commonly used for the lifting and the suspension of materials. In the oil and gas, construction , and maritime industries, air winches are frequently preferred to electric, diesel, and hydraulic winches because of their durability ...
Some modern patrol vessels are equipped with a stern launching ramp, or simply launching ramp, for deploying smaller rescue or pursuit boats without requiring the parent ship to first come to a halt. [ 1 ] [ 2 ] [ 3 ] Typically the smaller craft are powered by water-jets, and can drive themselves up the ramp by their own power.
USS Artisan with USS Antelope (IX-109) and LST-120 in the dock at Espiritu Santo, New Hebrides Islands, 8 January 1945 Los Alamos (AFDB-7), with a repaired submarine at Holy Loch, Scotland in 1985 YFD-2 The first Yard Floating Dock built in 1901, arriving Pearl Harbor 23 October 1940 from New Orleans Naval Yard USS Pennsylvania in drydock USS Dewey, the second YFD, c. 1906–1907
Coed sprint race at 2008 National Concrete Canoe Competition in Montreal, Quebec. A concrete canoe is a canoe made of concrete, typically created for an engineering competition. In spirit, the event is similar to that of a cardboard boat race—make the seemingly unfloatable float.
Vitruvius, a military engineer writing about 28 BC, defined a machine as "a combination of timber fastened together, chiefly efficacious in moving great weights".About a century later, Hero of Alexandria summarized the practice of his day by naming the "five simple machines" for "moving a given weight by a given force" as the lever, windlass, screw for power, wedge, and tackle block (pulley).