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Bollard pull is a conventional measure of the pulling (or towing) power of a watercraft.It is defined as the force (usually in tonnes-force or kilonewtons (kN)) exerted by a vessel under full power, on a shore-mounted bollard through a tow-line, commonly measured in a practical test (but sometimes simulated) under test conditions that include calm water, no tide, level trim, and sufficient ...
The capstan equation [1] or belt friction equation, also known as Euler–Eytelwein formula [2] (after Leonhard Euler and Johann Albert Eytelwein), [3] relates the hold-force to the load-force if a flexible line is wound around a cylinder (a bollard, a winch or a capstan). [4] [1]
Bollard pull: 110,000 lb (50,000 kg) Water cannons: fore and aft, 3,500 US gal/min (790 m 3 /h) C-Tractor is a class of fourteen tractor tugs built by North American ...
Bollard pull can increase up to 30% with ducts. With decelerating ducts, the circulation opposite of the Kort nozzle, resulting in a negative thrust of the duct. This type is used for high speed vessels with increased exposure to cavitation and vessels that want to reduce noise levels, such as warships.
The icebreaker is propelled by two 5-megawatt (6,700 hp) ABB Azipod azimuth thrusters that produce a bollard pull of 115 tonnes-force (127 short tons-force; 1,130 kN) in ahead and 95 tonnes-force (105 short tons-force; 930 kN) in astern direction, [4] and enable the vessel to break up to 1.5 metres (4.9 ft) thick ice.
Selma Blair is sharing an update on her health following new advances in multiple sclerosis treatment. Blair walked the red carpet at Elle's Women in Hollywood 2024 event without a walking cane or ...
When to shop for car insurance. Beyond renewal time, major life changes and unexpected circumstances often call for a fresh look at your insurance options.
The reference load used in the design and testing of the towing winch is twice the static bollard pull. Even if AHTS-vessels are customized for anchor-handling and towing, they can also undertake, for example, ROV ( remotely operated underwater vehicle ) services, safety/rescue services, and supply duties between mainland and offshore ...