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Astern propulsion does not necessarily imply the ship is moving astern (in reverse); astern propulsion is used to slow a ship by applying a force in the direction of the bow of the ship, instead of the stern. The equivalent concept for an airplane is thrust reversal. In a sailing ship astern propulsion can be achieved by the appropriate ...
Propulsion by sail generally consists of a sail hoisted on an erect mast, supported by stays, and controlled by lines made of rope. Sails were the dominant form of commercial propulsion until the late nineteenth century, and continued to be used well into the twentieth century on routes where wind was assured and coal was not available, such as ...
The Kort nozzle is a shrouded propeller assembly for marine propulsion. The cross-section of the shroud has the form of a foil, and the shroud can offer hydrodynamic advantages over bare propellers, under certain conditions. Advantages are increased efficiency at lower speeds (<10 knots), better course stability and less vulnerability to debris.
Astern (adjective): toward the rear of a ship (opposite of "forward"). [9] Athwartships: toward the sides of a ship. [1] Aweather: toward the weather or windward side of a ship. [10] Aweigh: just clear of the sea floor, as with an anchor. [11] Below: a lower deck of the ship. [1] Belowdecks: inside or into a ship, or down to a lower deck. [12]
Lift on a sail (L), acting as an airfoil, occurs in a direction perpendicular to the incident airstream (the apparent wind velocity, V A, for the head sail) and is a result of pressure differences between the windward and leeward surfaces and depends on angle of attack, sail shape, air density, and speed of the apparent wind.
Propulsion: Sail; As built, with 24,000 sq ft (2,200 m 2) of sail; reduced shortly afterwards to 21,500 sq ft (2,000 m 2) ... and a seventh 9-inch gun facing astern.
The superiority of electric podded propulsion in icebreaking ships, especially when running astern, was proved when the first propulsion pod was installed on fairway maintenance vessel Seili, owned by the Finnish Maritime Administration, in 1990. Before the conversion the ship could not break ice astern at all, but after the propeller and ...
Sail; Sailcloth; Saildrive; Schottel (company) Screw steamer; Slow steaming; Solutions for cavitation in marine propellers; Stave bearing; Marine steam engine; Sterndrive; Still engine; Hot-bulb engine; Stuffing box