United States O-class submarine

USS O-1, lead ship of her class in dry dock at Portsmouth Navy Yard in September 1918
Class overview
Name	O class
Operators	United States Navy
Preceded by	N class
Succeeded by	R class
Built	1916–1918
In commission	1918–1931, 1941–1946
Completed	16
Lost	2
Retired	14
General characteristics
Type	Submarine
Displacement	EB design: 520 long tons (528 t) surfaced 629 long tons (639 t) submerged Lake design: 485 long tons (493 t) surfaced 566 long tons (575 t) submerged
Length	EB design: 172 ft 4 in (52.53 m) Lake design: 175 ft (53 m)
Beam	EB design: 18 ft (5.5 m) Lake design: 16 ft 7 in (5.05 m)
Propulsion	EB design: 2 × 440 hp (328 kW) NELSECO 6-EB-14 diesel engines 2 × 370 hp (276 kW) New York Navy Yard (O1-O5) or Electro Dynamic Co. electric motors 2 × 60-cell batteries 2 × shafts Lake design: 2 × 500 hp (373 kW) Busch-Sulzer diesel engines 2 × 400 hp (298 kW) Diehl Manufacture Co. electric motors 1 × 120-cell batteries 2 × shafts
Speed	EB design: 14 knots (26 km/h; 16 mph) surfaced 10.5 knots (19.4 km/h; 12.1 mph) submerged Lake design: 14 knots (26 km/h; 16 mph) surfaced 11 knots (20 km/h; 13 mph) submerged
Range	5,500 nmi (10,200 km) at 11.5 kn (21.3 km/h; 13.2 mph) surfaced 250 nmi (460 km) at 5 kn (9.3 km/h; 5.8 mph) submerged
Test depth	200 ft (61 m)
Complement	29
Armament	4 × 18-inch (450 mm) torpedo tubes, 8 torpedoes 1 × 3-inch (76 mm)/23-caliber gun (retractable deck gun)[1]

The United States Navy (USN)'s sixteen O-class coastal patrol submarines were built during World War I and served the USN from 1918 through the end of World War II.