- Tench class submarine
Class overview Builders: Portsmouth Naval Shipyard, Electric Boat Company, Boston Navy Yard Operators: United States Navy Preceded by: Balao class Succeeded by: Barracuda class Subclasses: Corsair class Built: 1944–1951 In commission: 1944–1975 Completed: 29 Cancelled: 51 Active: 1 Lost: 0 Retired: 28 Preserved: 2 General characteristics Type: Diesel-electric submarine Displacement: 1,570 tons (1,595 t) surfaced
2,416–2,429 tons (2,455–2468 t) submerged
Length: 311 ft 8 in – 311 ft 9 in (95.0 m) Beam: 27 ft 3 in – 27 ft 4 in (8.3 m) Draft: 17 ft (5.2 m) maximum Propulsion:
4 × diesel engines driving electrical generators (Fairbanks-Morse or General Motors)2,740 shp (2.0 MW) submerged
2 × 126-cell Sargo batteries
2 × low-speed electric motors (Elliott Company, General Electric, or Westinghouse)
5,400 shp (4.0 MW) surfaced
Speed: 20.25 knots (38 km/h) surfaced
8.75 knots (16 km/h) submerged
Range: 11,000 nautical miles (20,000 km) surfaced at 10 knots (19 km/h) Endurance: 48 hours at 2 knots (3.7 km/h) submerged
75 days on patrol
Test depth: 400 ft (120 m) Complement: 10 officers, 71 enlisted Armament: 10 × 21-inch (533 mm) torpedo tubes
(six forward, four aft)
28 torpedoes 
1 × 5-inch (127 mm) / 25 caliber deck gun 
Bofors 40 mm and Oerlikon 20 mm cannon
Tench-class submarines were a type of submarine built for the United States Navy (USN) between 1944 and 1951. They were an evolutionary improvement over the Gato and Balao classes, only about 35 to 40 tons larger, but more strongly built and with a slightly improved internal layout. Further improvements were made beginning with SS-435, which are sometimes referred to as Corsair class.
Initial plans called for 146 to be built, but 115 were cancelled in 1944 and 1945 when it became apparent that they would not be needed to defeat Japan. The remaining 31 were commissioned between October 1944 (Tench) and February 1951 (Grenadier).
One Tench (ex-Cutlass was transferred from the USN to the Republic of China Navy as Hai Shih. Two went to Italy as the Gianfranco Gazzana-Priaroggia class. USS Argonaut (SS-475) was sold to the Royal Canadian Navy in 1968, renamed Greater Underwater Propulsion Power Program). The difference is noticeable by the level foredeck and the rounded bow.
Three Tench Class submarines are on display for the general public.
- USS Requin (SS-481) at the Carnegie Science Center in Pittsburgh, PA.
- USS Torsk (SS-423), moored at Pier Three, Baltimore's Inner Harbor, (alongside the National Aquarium in Baltimore) in Maryland.
- USS Thornback (SS-418), on display at Rahmi M. Koç Museum, Golden Horn in Istanbul.
United States naval ship classes of World War II
- ^ a b c d e f g h i j k l m n o p q Bauer, K. Jack; Roberts, Stephen S. (1991). Register of Ships of the U.S. Navy, 1775-1990: Major Combatants. Westport, Connecticut: Greenwood Press. pp. 280–282. ISBN 0-313-26202-0.
- ^ a b Friedman, Norman (1995). U.S. Submarines Through 1945: An Illustrated Design History. Annapolis, Maryland: United States Naval Institute. pp. 285–304. ISBN 1-55750-263-3.
- ^ a b c d e f g h i U.S. Submarines Through 1945 pp. 305-311
- ^ http://www.globalsecurity.org/military/systems/ship/guppy.htm
Aircraft carriers Light aircraft carriers Escort carriers Battleships Large cruisers Heavy cruisers Light cruisers Destroyers Destroyer escorts Patrol frigates Minesweepers Submarines
- S — Single ship of class
- C — Completed after the war
- X — Cancelled
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