United States C-class submarine

	USS Tarpon, 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 7 in (3.23 m)
Installed power	500 horsepower (370 kW) surfaced; 300 hp (220 kW) submerged;
Propulsion	2 × Craig Shipbuilding Company gasoline engine; 2 × Electro Dynamic electric motors, ; 2 × 60-Cell batteries; 2 × Propeller;
Speed	10.5 kn (19.4 km/h; 12.1 mph) surfaced; 9 kn (17 km/h; 10 mph) submerged;
Range	800 nmi (1,500 km; 920 mi) surfaced; 80 nmi (150 km; 92 mi) submerged;
Test depth	200 ft (61 m)
Complement	1 officer; 14 enlisted;
Armament	2 × 18 inch (450 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 long tons (279 t) submerged vs. 173 long tons (176 t) submerged, and were the first United States submarines with two-shaft propulsion, doubling the machinery of the B class.