USS O-15

USS O-15 at the Philadelphia Navy Yard at Philadelphia, Pennsylvania, on 28 June 1919.
History
United States
Name	O-15
Ordered	3 March 1916
Builder	California Shipbuilding Company, Long Beach, California
Laid down	21 September 1916
Launched	12 February 1918
Commissioned	27 August 1918
Decommissioned	11 June 1924
Stricken	9 May 1930
Fate	Sold for scrap, 30 July 1930
General characteristics
Class and type	O-class submarine
Displacement	491 long tons (499 t) surfaced 566 long tons (575 t) submerged
Length	175 ft 3 in (53.4 m)
Beam	16 ft 9 in (5.1 m)
Draft	13 ft 9 in (4.2 m)
Installed power	880 bhp (660 kW) (diesel) 740 hp (550 kW) (electric)
Propulsion	2 × diesel engines 2 × electric motors
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; 6,300 mi) at 11.5 knots (21.3 km/h; 13.2 mph) on the surface
Test depth	200 feet (61.0 m)
Complement	2 officers, 27 enlisted
Armament	4 × 18-inch (450 mm) torpedo tubes 1 × 3"/50 caliber deck gun

USS O-15 (SS-76) was one of 16 O-class submarines built for the United States Navy during World War I.

The later O-boats (O-11 through O-16) were designed by Lake Torpedo Boat Company to different specifications from the earlier ones designed by Electric Boat. They did not perform as well, and are sometimes considered a separate class.^[1] The submarines had a length of 175 feet 3 inches (53.4 m) overall, a beam of 16 feet 9 inches (5.1 m) and a mean draft of 13 feet 9 inches (4.2 m). They displaced 491 long tons (499 t) on the surface and 566 long tons (575 t) submerged. The O-class submarines had a crew of 29 officers and enlisted men. They had a diving depth of 200 feet (61.0 m).^[2]

For surface running, the boats were powered by two 440-brake-horsepower (328 kW) diesel engines, each driving one propeller shaft. When submerged each propeller was driven by a 370-horsepower (276 kW) electric motor. They could reach 14 knots (26 km/h; 16 mph) on the surface and 10.5 knots (19.4 km/h; 12.1 mph) underwater. On the surface, the O class had a range of 5,500 nautical miles (10,200 km; 6,300 mi) at 11.5 knots (21.3 km/h; 13.2 mph).^[2]

The boats were armed with four 18 inch (450 mm) torpedo tubes in the bow. They carried four reloads, for a total of eight torpedoes. The O-class submarines were also armed with a single 3"/50 caliber deck gun.^[2]

O-15 was laid down on 21 September 1916 by California Shipbuilding Company in Long Beach, California. The boat was launched on 12 February 1918, sponsored by Mrs. J. J. Murphy, and commissioned on 27 August 1918. Commissioning during the final months of World War I, O-15 saw brief war time service, on patrol along the Atlantic coast. After the war, she reported to Philadelphia, Pennsylvania, where machinists and electricians worked on her until 20 September 1919, when she was reduced to "in commission, in reserve," at Cape May, New Jersey. She departed Philadelphia in April 1920 and proceeded, via Jamaica, to Coco Solo, Panama Canal Zone, where she underwent overhaul and conducted experimental tests. Conducting training cruises, she operated in and around Cuba and the Virgin Islands early in 1922 and returned to Coco Solo in April.

O-15 reported to Philadelphia in November 1923 and decommissioned there 11 June 1924 after just five and a half years of service. Struck from the Naval Vessel Register on 9 May 1930, she was scrapped, under terms of the London Naval Treaty on 30 July 1930.

• Friedman, Norman (1995). U.S. Submarines Through 1945: An Illustrated Design History. Annapolis, Maryland: Naval Institute Press. ISBN 1-55750-263-3.
• Gardiner, Robert & Gray, Randal, eds. (1985). Conway's All the World's Fighting Ships 1906–1921. Annapolis, Maryland: Naval Institute Press. ISBN 0-85177-245-5.
•  This article incorporates text from the public domain Dictionary of American Naval Fighting Ships. The entry can be found here.

• Photo gallery of USS O-15 at NavSource Naval History