United States C-class submarine

USS Tarpon (later C-3), 1909
Class overview
Builders	Electric Boat (design) Fore River Shipyard, Quincy, Massachusetts
Operators	United States Navy
Preceded by	B class
Succeeded by	D class
Built	1906–1909
In commission	1908–1919
Completed	5
Retired	5
General characteristics
Type	Submarine
Displacement	238 long tons (242 t) surfaced 275 long tons (279 t) submerged
Length	105 ft 4 in (32.11 m)
Beam	13 ft 11 in (4.24 m)
Draft	10 ft (3.0 m)
Propulsion	2 × Craig Shipbuilding Co. gasoline engines, 500 hp (370 kW) total[1] 2 × Electro Dynamic electric motors, 300 hp (220 kW) total 2 × 60-cell batteries 2 shafts[2]
Speed	10.5 knots (19.4 km/h; 12.1 mph) surfaced 9 knots (17 km/h; 10 mph) submerged
Range	800 nautical miles (1,500 km; 920 mi) (surfaced), 80 nautical miles (150 km; 92 mi) (submerged)
Test depth	200 ft (61 m)
Complement	15 (1 officer and 14 enlisted)
Armament	2 × 18 in (457 mm) bow torpedo tubes, (4 torpedoes)

The C-class submarines were five United States Navy submarines built by the Fore River Shipbuilding Company in Quincy, Massachusetts, under a subcontract from the Electric Boat Company. Built between 1906 and 1909, and in commission from 1908 to 1919, all five were subsequently sold for scrap in 1920. They were considerably larger than the preceding B-class at 275 tons submerged vs. 173 tons submerged, and were the first United States submarines with two-shaft propulsion, doubling the machinery of the B class.