United States F-class submarine

	These boats are (from front to back): ; USS F-4, ex-Skate, F-2, ex-Barracuda, F-3, ex-Pickerel, and F-1, ex-Carp, in Honolulu, Territory of Hawaii, in 1914. Note the "fish" flags and 13-star "boat" ensigns flown by these submarines.
Class overview
Name	F class
Builders	Electric Boat (design); Union Iron Works, San Francisco, California (F-1 & F-2); The Moran Company, Seattle, Washington (F-3 & F-4);
Operators	United States Navy
Preceded by	E class
Succeeded by	G class
Built	1911–1912
In commission	1912–1922
Completed	4
Lost	2
Retired	2
General characteristics
Type	Submarine
Displacement	330 long tons (335 t) surfaced; 400 long tons (406 t) submerged;
Length	142 ft 6 in (43.43 m)
Beam	15 ft 5 in (4.70 m)
Draft	12 ft 2 in (3.71 m)
Installed power	780 hp (582 kW) diesel; 620 hp (462 kW) electric;
Propulsion	2 × NELSECO diesel engines; 2 × Electro Dynamic electric motors; 2 × 60-cell batteries; 2 × Propellers;
Speed	13.5 kn (25.0 km/h; 15.5 mph) surfaced; 11.5 kn (21.3 km/h; 13.2 mph) submerged;
Range	2,300 nmi (4,300 km; 2,600 mi) at 11 kn (20 km/h; 13 mph) surfaced; 100 nmi (190 km; 120 mi) at 5 knots (9.3 km/h; 5.8 mph) submerged;
Test depth	200 ft (61 m)
Capacity	11,500 US gal (44,000 L; 9,600 imp gal) fuel
Complement	1 officers; 21 enlisted;
Armament	4 × 18 inch (450 mm) bow torpedo tubes (4 torpedoes)

The F-class submarines were a group of four submarines designed for the United States Navy by Electric Boat in 1909. F-1 and F-2 were built by Union Iron Works, in San Francisco, while F-3 and F-4 were built by The Moran Company in Seattle.