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1889 Arthur Krebs & Jean Rey periscope for the French submarine Gymnote. Periscopes allow a submarine, when submerged at a relatively shallow depth, to search visually for nearby targets and threats on the surface of the water and in the air. When not in use, a submarine's periscope retracts into the hull.
At depths below periscope depth submarines determine their position using: Dead reckoning course information obtained from the ship's gyrocompass, measured speed and estimates of local ocean currents, this could also be considered an estimated position as long as the ocean current is computed in.
The Royal Netherlands Navy had been experimenting as early as 1938 with a simple pipe system on the submarines O-19 and O-20 that enabled diesel propulsion at periscope depth, while also charging the batteries. The system was designed by the Dutchman Jan Jacob Wichers. [6]
Within minutes the submarine was again sighted from the air and was bombed. Two of the "cruisers" closed for a kill and nine depth charges were dropped at a distance of about 1,000 yards (910 m). When the attack ceased, Nautilus rose to periscope depth. Ships surrounded her. Sighting on Kirishima, she fired two bow tubes; one misfired, one ...
[57] [139] When surfaced or at periscope depth, the Collins-class boats can use a Kelvin Hughes Type 1007 surface search radar, which is situated in a retractable mast on the fin. [10] [139] The fin of Sheean. The CH093 attack periscope mast is extended, and one of the panels for the distributed sonar array can be seen at the bottom right of ...
This is the maximum depth at which a submarine is permitted to operate under normal peacetime circumstances, and is tested during sea trials.The test depth is set at two-thirds (0.66) of the design depth for United States Navy submarines, while the Royal Navy sets test depth at 4/7 (0.57) the design depth, and the German Navy sets it at exactly one-half (0.50) of design depth.
Ballast tanks were almost never blown at depth, as doing so could cause the submarine to rocket to the surface out of control. Normal procedure was to drive the submarine to periscope depth, raise the periscope to verify that the area was clear, and then blow the tanks and surface the submarine. [25]
Submarines can be spotted from aircraft when they're operating at a shallow depth pretty much anywhere where the water is clear (which is why they generally stay bellow periscope depth) so this is isn't all that rare. Nick Dowling 03:10, 3 August 2008 (UTC) Support-- nicer image than the failed candidate, good encyc. value. Not a common photo ...