Tang-class submarine

	USS Gudgeon (the three distinctive shark-fin domes are the PUFFS sonar, one is just aft of the sail, below the flag).
Class overview
Name	Tang class
Builders	Portsmouth Naval Shipyard; Electric Boat Company;
Operators	United States Navy
Preceded by	Barracuda class
Succeeded by	Grayback-class; USS Nautilus; USS Darter;
Built	1949–1952
In commission	1951–1983
Completed	6
Retired	6
Preserved	2
General characteristics
Type	Submarine
Displacement	1,560–2,050 long tons (1,585–2,083 t) surfaced; 2,260–2,700 long tons (2,296–2,743 t) submerged;
Length	268 ft (82 m), extended to 277 ft (84 m), then to 292 ft (89 m)
Beam	27 ft (8.2 m)
Draft	17 ft (5.2 m)
Propulsion	four GM 16-338 "pancake" diesel engines (4,000 shp (3,000 kW) total), replaced by three Fairbanks Morse 38D8-1/8 opposed piston engines (4,800 shp (3,600 kW) total),; two electric motors (4,700 shp (3,500 kW) total),; four 126-cell batteries,; two shafts;
Speed	15.5 kn (28.7 km/h; 17.8 mph) surfaced; 18.3 kn (33.9 km/h; 21.1 mph) submerged;
Range	11,500 nmi (21,300 km) at 10 kn (19 km/h; 12 mph) surfaced
Endurance	1 hour at 17.5 kn (32.4 km/h; 20.1 mph) on battery
Test depth	700 ft (210 m)
Complement	8 officers, 75 enlisted
Armament	8 × 21 inch (533 mm) torpedo tubes (6 forward, 2 aft), 26 torpedoes

The Tang-class submarines were the first submarines designed (under project SCB 2) and built by the United States Navy after WWII. They incorporated the best features of the high-speed German Type XXI U-boat and the venerable U.S. Navy fleet submarine. The Tang-class, with the fleet submarines converted under the Greater Underwater Propulsion Power (GUPPY) program, had much higher submerged performance than their predecessors, but were quickly surpassed by the nuclear-propelled submarines that entered service beginning in 1954. Six units in total were built.

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