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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 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 ...
Congressman Hunter's office estimated it would cost US$33 million a year to ... (9.3 km/h; 5.8 mph) in 1-metre (3 ft 3 in) level ice, and a bollard pull of 200 ...
Cost € 97 million (US$ ... With a bollard pull of approximately 100 tonnes, Turva is capable of towing even the largest tankers regularly sailing in the Baltic Sea ...
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.
In the tests, the much smaller tug was attached to the stern of the icebreaker to determine its bollard pull while the icebreaker towed it at different speeds. [22] As of 2013, Otso and Kontio are the last Finnish icebreakers designed solely for escorting merchant ships through ice-infested waters. [5]
Mellum: 5 nmi (9.3 km) southwest off Heligoland, bollard pull of 100 t [12] Neuwerk: 5 nmi (9.3 km) southwest off Süderoogsand (Nordfriesland), bollard pull of 113 t [13] Baltic Sea. Bülk: Kiel Fjord, bollard pull of 40 t [14] Scharhörn: Hohwacht Bay (between Kiel and Fehmarn), bollard pull of 40 t [15] Baltic: Warnemünde, 127 t of bollard ...
The bollard pull and propulsion power would have to be sufficient to allow continuous operation in level ice with a thickness of 1.5 metres (5 ft) and 10–20-centimetre (4–8 in) snow cover as well as make the vessel capable of opening a 25-metre (82 ft) channel through uniform 1.2 metres (4 ft) ice field at a speed of 6 knots (11 km/h; 6.9 ...
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