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The Foxtrot was a numerous class of Diesel-electric patrol submarines built in the Soviet Union from 1957 to 1983. These submarines
could stay submerged for a maximum of five days before having to return to the surface to gather air for their Diesel engines. They
were comparable in performance and armament to the counterparts of other contemporary nations, but their three six-blade propellers
rendered them noisier than the largest part of western counterparts. The Foxtrot class was one of the last designs
introduced before the adoption of teardrop-shaped hulls, which offered a much better underwater performance, and it was completely
obsolete by the time when the last submarine of the class was launched (in 1983). The Russian Navy decommissioned its last submarines
of the Foxtrot class between 1995 and 2000. Exemplars with simplified electronic equipment have been exported to India, Libya and Cuba.
Foxtrot class: 75 units
Type: Diesel-electric patrol submarine
Length: 89.9 meters
Beam: 7.4 meters
Draught: 5.9 meters
Displacement (surfaced): 1983 tonnes
Displacement (submerged): 2515 tonnes
Propulsion: 3 x shaft, 3 x Diesel engine 2000 horsepower, 1 x electric motor 2700 horsepower, 2 x electric motor 1350 horsepower
Speed (surfaced): 16 knots (30 kilometers/hour)
Speed (submerged): 15 knots (28 kilometers/hour)
Range (surfaced): 20000 nautical miles (37000 kilometers) at 8 knots
Range (snorkeling): 11000 nautical miles (20000 kilometers) at 8 knots
Range (submerged): 380 nautical miles (700 kilometers) at 2 knots
Test depth: 246-296 meters
Complement: 78
Armament: 10 x 533-millimeter torpedo tube (6 at prow, 4 astern), 22 x torpedo or 44 x AMD-1000 mine
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