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The combined port anchor windlass and winch of the modern ferry Stena Britannica. The hydraulically operated brake and pawl allows the anchor to be dropped from the ship's bridge. [citation needed] A windlass is a machine used on ships that is used to let-out and heave-up equipment such as a ship's anchor or a fishing trawl. On some ships, it ...
An anchor secured to the ship's side. The projecting beam the anchor hangs from when not secured is a cathead (left). The anchor has a stock (cross-piece, in this case wooden) below, and curved flukes above (end-on); the shank is the near-vertical metal bar running between them, lashed with the shank painter Cathead on bow of the barque James Craig; the cat tail protrudes onto the deck and is ...
A windlass cocking mechanism on crossbows was used as early as 1215 in England, and most European crossbows had one by the Late Middle Ages. [6] Windlasses are sometimes used on boats to raise the anchor as an alternative to a vertical capstan (see anchor windlass). The handle used to open locks on the UK's inland waterways is called a windlass.
On 29 September, Windlass began dragging the bottom with a "hawk" anchor and, on 6 October, located the self-propelled seaplane wrecking derrick on the bottom, upside down. Despite a period of "unusually adverse weather" and what Windlass' command history termed "the usual salvage job setbacks," Windlass raised YSD-68 early in November.
Capstan winches were also important on sailing trawlers (e.g. Brixham trawlers) as a means for fetching in the nets after the trawl. When they became available, steam powered capstan winches offered a great saving in effort. These used a compact combined steam engine and boiler below decks that drove the winch from below via a shaft.
The machinery is specifically designed for anchor handling operations. They also have arrangements for quick anchor release, which is operable from the bridge or other normally crewed locations in direct communication with the bridge. The reference load used in the design and testing of the towing winch is twice the static bollard pull.
The anchors are usually laid in prearranged positions by an anchor tender, and the moored vessel uses its own winches to adjust position and tension. [ 53 ] Similar arrangements are used for some types of single buoy moorings , like the catenary anchor leg mooring (CALM) used for loading and unloading liquid cargoes.
Each line has its own 1,350 kilowatts (1,810 hp) single drum winch. The mooring system can be used in water depths of up to 450 m. The Saipem 7000 is also equipped with two anchor windlasses equipped with 550m of 130mm chain and 35 tonne anchor.
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