United States O-class submarine

	USS O-1, lead ship of her class, in dry dock, at Portsmouth Navy Yard, on 5 September 1918
Class overview
Name	O class
Builders	Portsmouth Navy Yard (O-1); Puget Sound Navy Yard (O-2); Fore River Shipyard (O-3 to O-10); Lake Torpedo Boat Company (O-11 to O-13); California Shipbuilding Company (O-14 to O-16);
Operators	United States Navy
Preceded by	N class
Succeeded by	R class
Built	1916–1918
In commission	1918–1931; 1941–1946;
Completed	16
Lost	3 (1 scuttled)
Scrapped	13
General characteristics
Class & type	O-1-class (O-1 to O-10)
Type	Submarine
Displacement	520 long tons (528 t) surfaced; 629 long tons (639 t) submerged;
Length	172 ft 4 in (52.53 m)
Beam	18 ft (5.5 m)
Draft	14 ft 5 in (4.39 m)
Installed power	880 bhp (656 kW) diesel; 740 hp (552 kW) electric;
Propulsion	2 × NELSECO 6-EB-14 diesel engines; 2 × New York Navy Yard (O-1-O-5) or Electro-Dynamic Company (O-6-O-10) electric motors; 2 × 60-cell batteries; 2 × Propellers;
Speed	14 knots (26 km/h; 16 mph) surfaced; 10.5 knots (19.4 km/h; 12.1 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	2 officers; 27 enlisted;
Armament	4 × 18 inch (450 mm) bow torpedo tubes (8 torpedoes); 1 × 3 in (76 mm)/23 caliber retractable deck gun;
General characteristics
Class & type	O-11-class (O-11 to O-16)
Type	Submarine
Displacement	485 long tons (493 t) surfaced; 566 long tons (575 t) submerged;
Length	175 ft (53 m)
Beam	16 ft 7 in (5.05 m)
Draft	13 ft 11 in (4.24 m)
Installed power	1,000 bhp (746 kW); 800 hp (597 kW);
Propulsion	2 × Busch-Sulzer diesel engines; 2 × Diehl Manufacture Company electric motors; 1 × 120-cell battery; 2 × shafts;
Speed	14 kn surfaced; 11 kn (20 km/h; 13 mph) submerged;
Range	5500 nmi at 11.5 kn surfaced; 250 nmi at 5 kn submerged;
Test depth	200 ft
Complement	2 officers; 27 enlisted;
Armament	4 × 18 inch bow torpedo tubes (8 torpedoes); 1 × 3 in/23 caliber retractable deck gun;

The United States O-class submarines were a class of sixteen coastal patrol submarines laid down for the United States Navy (USN) just before, and just after, the United States entry into World War I. The USN used two different designs by two different builders, the O-1-class, built by the Electric Boat Company, of Groton, Connecticut, and the O-11-class, built by the Lake Torpedo Boat Company, of Bridgeport, Connecticut. The O-1-class served during WWI, and seven were recommissioned as training boats during World War II. The O-11-class were all decommissioned in June 1924, and most were scrapped in 1930.