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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 installations.
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.
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A tugboat is typically rated by its engine's power output and its overall bollard pull. The largest commercial harbour tugboats in the 2000s–2010s, used for towing container ships or similar, had around 60 to 65 short tons-force (530–580 kN) of bollard pull, which is described as 15 short tons-force (130 kN) above "normal" tugboats. [5] [6]
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.
Thirty years after its short but memorable run on ABC, it is widely regarded as a miraculous one-season wonder that captures the era's competing strains of irony and earnestness.
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