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The topping lift indicated Topping lift on a US Yachts US 22 sailboat The topping lift (more rarely known as an uphaul ) is a line which applies upward force on a boom on a sailboat . Part of the running rigging , topping lifts are primarily used to hold a boom up when the sail is lowered. [ 1 ]
A boat lift, ship lift, or lift lock is a machine for transporting boats between water at two different elevations, and is an alternative to the canal lock. It may be vertically moving, like the Anderton boat lift in England , rotational, like the Falkirk Wheel in Scotland , or operate on an inclined plane , like the Ronquières inclined plane ...
The most common lift table design incorporates hydraulic cylinders and an electrically powered pump to actuate the scissor lifting mechanism. Lift tables can also be driven by pneumatic sources, trapezoidal-threaded screw drives, push chains or by hydraulic foot pump when the load is not heavy. Lift tables can be mounted in a pit for floor ...
A small motor-boat lifted from the water by a boat lift at La Rochelle, France, 2016. Smaller devices called "Boat lifts" are available that simply raise yachts, sailboats, or small watercraft above the water level at a dock for storage, for reduced maintenance cost and increased security. They can be operated by cables, by hydraulics, or by ...
AAW An acronym for anti-aircraft warfare. aback (of a sail) Filled by the wind on the opposite side to the one normally used to move the vessel forward.On a square-rigged ship, any of the square sails can be braced round to be aback, the purpose of which may be to reduce speed (such as when a ship-of-the-line is keeping station with others), to heave to, or to assist moving the ship's head ...
A liftboat is a self-propelled, self-elevating vessel used for offshore oil and gas or wind farm activities. Learn about its design, operation, types, and recent incidents in the Gulf of Mexico.
Planing is the mode of operation for a waterborne craft that uses hydrodynamic lift rather than buoyancy to support its weight. Learn about the history, mechanics, and techniques of planing, and see how it applies to different types of boats and surfboards.
Learn about the history and operation of the Peterborough Lift Lock, a hydraulic boat lift on the Trent-Severn Waterway in Ontario, Canada. The lock is a National Historic Site and an engineering landmark, with two caissons that raise or lower boats 65 feet (20 m) using gravity and water.
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