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A ship's wheel or boat's wheel is a device used aboard a water vessel or airship, in which a helmsman steers the vessel and control its course. Together with the rest of the steering mechanism, it forms part of the helm (the term helm can mean the wheel alone, or the entire mechanism by which the rudder is controlled [ 1 ] ).
Modern ship rudder (the long red rectangle behind the propeller) RMS Olympic's rudder turned. A rudder is a primary control surface used to steer a ship, boat, submarine, hovercraft, airship, or other vehicle that moves through a fluid medium (usually air or water).
Applying the minimal rudder required to steer a course reduces drag of the ship, thereby favorably impacting the ship's speed and operating costs. One of the helmsman's most important duties is steering a ship in a harbor or seaport when reduced speeds slow a ship's response to the rudder.
[2]: p.173 The helmsman himself still usually did not stand on the topmost deck, but rather viewed what lay ahead of the ship through a small port or hatchway in the deck above him called a companion. To move the ship to port, the forward-facing helmsman pulled the top of the staff to his left and pushed the pole down and to the right; to move ...
Also ship's magazine. The ammunition storage area aboard a warship. magnetic bearing An absolute bearing using magnetic north. magnetic north The direction towards the North Magnetic Pole. Varies slowly over time. maiden voyage The first voyage of a ship in its intended role, i.e. excluding trial trips. Maierform bow A V-shaped bow introduced in the late 1920s which allowed a ship to maintain ...
AAW An acronym for anti-aircraft warfare. aback (of a sail) Filled by the wind on the opposite side to the one normally used to move the vessel forward.On a square-rigged ship, any of the square sails can be braced round to be aback, the purpose of which may be to reduce speed (such as when a ship-of-the-line is keeping station with others), to heave to, or to assist moving the ship's head ...
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Jesus of Lübeck of 1544 was a ship of 700 long tons (780 short tons; 710 t), the same as the Mary Rose. [7] However, how similar later medieval hulks were to their ancestors is unknown. There is some evidence of hybridization with the cog form, showing both hulk and post-construction. [ 8 ]