United States N-class submarine

USS N-7 (SS-59)
Class overview
Name:	N class
Builders:	Seattle Construction and Drydock Co., Seattle, Washington (N-1 to N-3) Lake Torpedo Boat Co., Bridgeport, Connecticut (N-4 to N-7)
Operators:	United States Navy
Preceded by:	AA-1 class
Succeeded by:	O class
Built:	1915–1917
In commission:	1917–1926
Completed:	7
Scrapped:	7
General characteristics
Type:	Submarine
Displacement:	N-1 to N-3: 348 long tons (354 t) surfaced 414 long tons (421 t) submerged N-4 to N-7: 340 long tons (345 t) surfaced 415 long tons (422 t) submerged
Length:	N-1 to N-3: 147 ft 3 in (44.88 m) N-4 to N-7: 155 ft (47 m)
Beam:	N-1 to N-3: 15 ft 9 in (4.80 m) N-4 to N-7: 14 ft 6 in (4.42 m)
Draft:	N-1 to N-3: 12 ft 6 in (3.81 m) N-4 to N-7: 12 ft 4 in (3.76 m)
Propulsion:	Diesel-electric N-1 to N-3: 2 × NELSECO Diesel engines, 600 hp (450 kW) total, 2 × Electro Dynamic electric motors, 300 hp (220 kW) total, 2 × 60-cell batteries, 2 × shafts N-4 to N-7: 2 × Busch-Sulzer Diesel engines, 600 hp (450 kW) total, 2 × Diehl electric motors,300 hp (220 kW) total, 2 × 60-cell batteries, 2 × shafts
Speed:	13 knots (24 km/h; 15 mph) surfaced 11 knots (20 km/h; 13 mph) submerged
Test depth:	200 ft (61 m)
Complement:	N-1 to N-3: 25 officers and men N-4 to N-7: 29 officers and men
Armament:	4 × 18 inch (450 mm) torpedo tubes, 8 torpedoes

The United States N-class submarines were a class of seven coastal defense submarines built for the United States Navy during World War I.

The boats were constructed by two companies to slightly different specifications; N-1, N-2, and N-3 were designed by the Electric Boat Company of Groton, Connecticut and built by the Seattle Construction and Drydock Company of Seattle, Washington, and N-4, N-5, N-6, and N-7 were designed and built by the Lake Torpedo Boat Company of Bridgeport, Connecticut. The N-boats built by Lake are sometimes considered a separate class.

The Electric Boat submarines had a length of 147 feet 3 inches (44.9 m) overall, a beam of 15 feet 9 inches (4.8 m) and a mean draft of 12 feet 6 inches (3.8 m). They displaced 347 long tons (353 t) on the surface and 414 long tons (421 t) submerged. The N-class submarines had a crew of 2 officers and 23 enlisted men. They had a diving depth of 200 feet (61.0 m).

The Lake submarines had a length of 155 feet (47.2 m) overall, a beam of 14 feet 6 inches (4.4 m) and a mean draft of 12 feet 4 inches (3.8 m). They displaced 331 long tons (336 t) on the surface and 385 long tons (391 t) submerged. The N-class submarines had a crew of 3 officers and 26 enlisted men. They also had a diving depth of 200 feet (61.0 m).

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