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French Narval-class Submarine
The ''Narval'' class (''sous-marins d'escadre'', "fleet submarines") were patrol submarines built for the French Navy in the 1950s. Design The ''Narval'' type was an offspring of the ''E-48'' project, inspired by the German Type XXI U-boats of the Second World War, particularly which were brought into French service. Compared to the Type XXI, the ''Narval'' class introduced an entirely new schnorchel system and novel detection systems, gained 33% in operational range on electric power (, compared to the available to the type XXI), and doubled the test depth. The propellers were also particularly studied to minimise noise. The hulls of the ''Narval''s were assembled from seven sections welded together. The engine were two-stroke diesels made by the French constructor Schneider, which proved unreliable and noisy to the point where the engine section became difficult to man at full power. From 1966 to 1970, the ''Narval''s underwent extensive modernisation, where their ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Submarine
A submarine (or sub) is a watercraft capable of independent operation underwater. It differs from a submersible, which has more limited underwater capability. The term is also sometimes used historically or colloquially to refer to remotely operated vehicles and Autonomous underwater vehicle, robots, as well as medium-sized or smaller vessels, such as the midget submarine and the wet sub. Submarines are referred to as ''boats'' rather than ''ships'' irrespective of their size. Although experimental submarines had been built earlier, submarine design took off during the 19th century, and they were adopted by several navies. They were first widely used during World War I (1914–1918), and are now used in many navy, navies, large and small. Military uses include attacking enemy surface ships (merchant and military) or other submarines, and for aircraft carrier protection, Blockade runner, blockade running, Ballistic missile submarine, nuclear deterrence, reconnaissance, conventio ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
72nd Parallel North
The 72nd parallel north is a circle of latitude that is 72 degrees north of the Earth's equatorial plane, in the Arctic. It crosses the Atlantic Ocean, Europe, Asia, the Arctic Ocean and North America. At this latitude, the sun is visible for 24 hours, 0 minutes during the summer solstice and Civil Twilight during the winter solstice. This is the parallel where twilight/ nighttime boundary on the equinoxes. Around the world Starting at the Prime Meridian and heading eastwards, the parallel 72° north passes through: : See also *71st parallel north The 71st parallel north is a circle of latitude that is 71 degrees north of the Earth's equatorial plane, in the Arctic. It crosses the Atlantic Ocean, Europe, Asia and North America, and passes through some of the southern seas of the Arctic O ... * 73rd parallel north {{geographical coordinates, state=collapsed n72 Geography of the Arctic ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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