(nautical) an azimuth thruster, an engine and ships' propeller in an underslung pod that is azimuth adjustable, to replace a fixed-azimuth propeller and rudder configuration
(nautical) To know, and demonstrate by reciting, the 32 points and quarter points of the magnetic compass from North or East, both clockwise and anticlockwise.
(nautical) A sea mark (a buoy or other floating or fixed structure) used in pilotage to indicate the position of a hazard and the direction of safe water.
Alternative spelling of centreboard [(British spelling, nautical) The adjustable keel on a small yacht or dinghy that acts, among other things, as ballast and to counteract the sideways force of the wind.]
(British spelling, nautical) The adjustable keel on a small yacht or dinghy that acts, among other things, as ballast and to counteract the sideways force of the wind.
(nautical) A circular disc of plate glass, set into the screen of a ship's bridge and spun at high speed by an electric motor in heavy rain or snow; it offers a clear view forward.
(nautical) The minimum bank angle which will submerge at least one non-watertight opening on a boat, ship, or other vessel, allowing for downflooding into the interior of the vessel.
(nautical) A chart showing the horizontal variation in the magnetic force acting on a ship's compass needle by the iron within the ship, as a function of course steered
(nautical, military, of wing-mounted gun turrets on a warship) Staggered; offset so that the wing turret on one side is mounted further forwards than the one on the opposite side.
(transport, nautical) A form of marine vessel which allows large floating objects (such as other ships, or oil platforms, etc) to be floated atop and floated off the ship's transport decktop.
(nautical, aeronautics) A relatively flat surface located well forward of a vehicle's center of gravity used for stability and, when movable, used for steering and attitude control; common on submarines, also used on surface ships and aircraft.
The loss of one degree of freedom in the three-dimensional rotational movement of a three-gimbal mechanism, which occurs when the axes of two of the three gimbals are driven into a parallel configuration, so that the system's rotational movement becomes two-dimensional (and necessarily remains so until an appropriate force is applied); the equivalent situation in a simulation of rotational movement, when the mathematical model uses Euler angles (representing pitch, yaw and roll) or their equivalent.
(nautical) A position of sails in a fore-and-aft rigged sailboat, in which the mainsail is set to the leeward and the jib to the windward. This position may be used when running (almost) straight downwind.
Alternative form of hangar queen [(idiomatic, slang, military, aviation) A grounded aircraft which is kept so that its parts can be used in other aircraft.]
(military, nautical) an amphibious assault water vessel designed to transport a tank across water to directly onto shore, where the tank may roll off the vessel onto the shore, while under enemy fire.
An engine for marine use, installed in a boat or ship. For small vessels, these are usually adapted automotive engines; for large vessels they are specially built for the purpose.
(nautical, physics) The vertical distance between the metacentre and center of mass (conventionally taken to be positive when the metacentre is above the center of mass, and negative when the center of mass is above the metacentre) of a vessel (such as a ship or a boat) when the vessel is upright with zero bank angle; measures the vessel's tendency to resist being rolled from the upright orientation; must be positive in order for the vessel to have positive static stability.
(nautical) The tendency of a ship or other water-going vessel to remain upright due to its centre of gravity being below its centre of buoyancy, ie. basically having most of its weight down low.
(nautical, chiefly military, historical) A bow that projects forwards below the waterline into a reinforced blade or point, used to sink other ships by ramming.
(nautical) Sailing on a reach, i.e. having the wind on either side and coming from an angle that is larger with respect to the bow than when sailing close-hauled.
Alternative spelling of rhumb line [(nautical) A line that cuts all meridians at the same angle, the path of a vessel that maintains a constant compass direction.]
Alternative spelling of rhumb line [(nautical) A line that cuts all meridians at the same angle, the path of a vessel that maintains a constant compass direction.]
(nautical, physics) The horizontal distance between the center of mass of a tilted vessel and the vertical line connecting its center of buoyancy and its metacentre (conventionally taken as positive if the aforementioned line lies on the low side of the center of mass, and negative if the line lies on the high side of the center of mass), measuring the strength of the vessel's tendency (or lack thereof) to return to an upright orientation.
(astronautics) A sail-like structure on a spacecraft consisting of enormous ultrathin mirrors, propulsion being achieved by the radiation pressure of light from a star or laser.
(nautical) Acronym of small waterplane area twin hull: a ship design philosophy for reducing pitching and rolling, and increasing stability, in all sea states.
Alternative spelling of telltale compass [(nautical) A compass installed in the cabin so that the captain or other officer may check the course of a ship without going to the deck; often upturned and suspended from the ceiling.]
Abbreviation of water bicycle. [A bicycle frame set between a pair of pontoon floats, with the pedals connected to a propeller and the handle bars connected to a rudder]
Alternative form of water wing (swimming aid) [One of a pair of inflatable plastic bands, normally worn on the upper arms, to help a wearer float in water and learn to swim.]
(of a motorboat propeller) Having blades that curve backwards, as respects the direction of rotation, so that they draw through the water without accumulating weeds.
(nautical) A vessel's motion rotating about the vertical axis, so the bow yaws from side to side; a characteristic of unsteadiness.
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