United States F-class submarine

	These boats are (from front to back): ; F-4, F-2, F-3, and F-1. 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; The Moran Company;
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 9 in (43.51 m)
Beam	15 ft 5 in (4.70 m)
Draft	12 ft 2 in (3.71 m)
Propulsion	2 × NELSECO diesel engines, 780 hp (582 kW); 2 × Electro Dynamic electric motors, 620 hp (462 kW); 2 × 60-cell batteries; 2 shafts;
Speed	13.5 knots (25.0 km/h; 15.5 mph) surfaced; 11.5 knots (21.3 km/h; 13.2 mph) submerged;
Range	2,300 nmi (4,300 km) at 11 kn (20 km/h; 13 mph) surfaced; 100 nmi (190 km) at 5 kn (9.3 km/h; 5.8 mph) submerged;
Test depth	200 ft (61 m)
Complement	22
Armament	4 × 18-inch (450 mm) torpedo tubes (bow); 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, Washington.

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