United States E-class submarine

USS E-1, lead ship of the class
Class overview
Name	E class
Builders	Electric Boat (design) Fore River Shipyard
Operators	United States Navy
Preceded by	D class
Succeeded by	F class
Built	1911–1912
In commission	1912–1921
Completed	2
Retired	2
General characteristics
Type	Submarine
Displacement	287 long tons (292 t) surfaced 342 long tons (347 t) submerged
Length	135 ft 3 in (41.22 m)
Beam	14 ft 7 in (4.45 m)
Draft	11 ft 8 in (3.56 m)
Propulsion	2 × NELSECO diesel engines, 700 hp (522 kW) 2 × Electro Dynamic electric motors, 600 hp (447 kW) 2 × 60-cell batteries 2 shafts[1]
Speed	13.5 knots (25.0 km/h; 15.5 mph) surfaced 11.5 knots (21.3 km/h; 13.2 mph) submerged
Range	2,100 nmi (3,900 km) at 11 kn (20 km/h; 13 mph) surfaced (8,486 US gal (32,120 L; 7,066 imp gal) fuel) 100 nmi (190 km) at 5 kn (9.3 km/h; 5.8 mph) submerged
Test depth	200 ft (61 m)
Complement	20
Armament	4 × 18 inch (450 mm) torpedo tubes (bow) 4 torpedoes

The E-class submarines were a class of two United States Navy submarines, built by the Fore River Shipbuilding Company of Quincy, Massachusetts, under a subcontract from the Electric Boat Company. They were used as coastal and harbor defense submarines prior to World War I. When hostilities broke out, the E class were mostly used as training boats; however, E-1 operated on war patrols based in the Azores. During this time, the need for an improved permanent bridge structure was discovered; the temporary piping-and-canvas bridges were inadequate in the North Atlantic.