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  2. Bollard pull - Wikipedia

    en.wikipedia.org/wiki/Bollard_pull

    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 ...

  3. Capstan equation - Wikipedia

    en.wikipedia.org/wiki/Capstan_equation

    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. Tugboat - Wikipedia

    en.wikipedia.org/wiki/Tugboat

    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]

  5. C-Tractor - Wikipedia

    en.wikipedia.org/wiki/C-Tractor

    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 ...

  6. Ville-class tug - Wikipedia

    en.wikipedia.org/wiki/Ville-class_tug

    Their kort-nozzle allows for a greater bollard pull however it loses its pull at anything over 10 knots (19 km/h; 12 mph) and loses speed in turns. [3] The Ville class are 13.71 m (45 ft 0 in) long with a beam of 4.72 m (15 ft 6 in) and a draught of 2.74 m (9 ft 0 in).

  7. Category:Nautical terminology - Wikipedia

    en.wikipedia.org/wiki/Category:Nautical_terminology

    Capsize screening formula; Capsizing; Sea captain; Captain of the port; Captain's cabin; Careening; Catamaran; Catboat; Cathead; Center console (boat) Centreboard; Chain; Chain girth; Chainplate; Chains (nautical) Channel (geography) Charlie Noble (chimney) Chief engineer; Chief mate; Chine (boating) Circle of death (boating) Cold ironing ...

  8. Ducted propeller - Wikipedia

    en.wikipedia.org/wiki/Ducted_propeller

    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.

  9. Force gauge - Wikipedia

    en.wikipedia.org/wiki/Force_gauge

    The same type of "weigh bar" can be used to measure horizontal loads and "drawbar pull" of wheeled/tracked or vehicles or "bollard pull" of boats or the "thrust" of jet engines when a proper "test rig" is designed and constructed to provide "frictionless" fore-aft movement of the load relative to the weigh bars.

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