USS K-7 (SS-38)

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The K-7 underway at half speed on 3 October 1914, probably in the vicinity of San Francisco, California.
History
Name: USS K-7
Builder: Union Iron Works, San Francisco, California
Launched: 20 June 1914
Commissioned: 1 December 1914
Decommissioned: 12 February 1923
Reclassified: SS-38, 17 July 1920
Struck: 18 December 1930
Fate: Sold for scrapping, 3 June 1931
General characteristics
Type: K-class submarine
Displacement:
  • 392 long tons (398 t) surfaced
  • 520 long tons (528 t) submerged
Length: 153 ft 7 in (46.8 m)
Beam: 16 ft 8 in (5.1 m)
Draft: 13 ft 1 in (4.0 m)
Installed power:
  • 950 bhp (710 kW) (diesel)
  • 340 hp (250 kW) (electric)
Propulsion:
Speed:
  • 14 knots (26 km/h; 16 mph) surfaced
  • 10.5 knots (19.4 km/h; 12.1 mph) submerged
Range:
  • 3,150 nmi (5,830 km; 3,620 mi) at 11 knots (20 km/h; 13 mph) on the surface
  • 120 nmi (220 km; 140 mi) at 5 knots (9.3 km/h; 5.8 mph) submerged
Test depth: 200 feet (61.0 m)
Complement: 28 officers and enlisted men
Armament: 4 × bow 18 in (457 mm) torpedo tubes

USS K-3 (SS-34) was an K-class submarine built for the United States Navy during the 1910s.

Description

The K-class boats had a length of 153 feet 7 inches (46.8 m) overall, a beam of 16 feet 8 inches (5.1 m) and a mean draft of 13 feet 1 inch (4.0 m). They displaced 451 long tons (458 t) on the surface and 527 long tons (535 t) submerged. The K-class submarines had a crew of 2 officers and 26 enlisted men. They had a diving depth of 200 feet (61.0 m).[1]

For surface running, the boats were powered by two 475-brake-horsepower (354 kW) NELSECO diesel engines, each driving one propeller shaft. When submerged each propeller was driven by a 170-horsepower (127 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 oats had a range of 3,150 nautical miles (5,830 km; 3,620 mi) at 11 knots (20 km/h; 13 mph)[1] and 120 nmi (220 km; 140 mi) at 5 knots (9.3 km/h; 5.8 mph) submerged.[2]

The K-class submarines were armed with four 18-inch (45 cm) torpedo tubes in the bow. They carried four reloads, for a total of eight torpedoes.[2]

Construction and career

The boat was laid down by the Union Iron Works at San Francisco, California, under a subcontract from Electric Boat Company of Groton, Connecticut. She was launched on 20 June 1914, sponsored by Mrs. Katie-Bel McGregor, daughter of the president of Union Iron Works, and commissioned at Mare Island on 1 December with Lieutenant J. V. Ogan in command.

As a unit of the Pacific Torpedo Flotilla, K-7 sailed for San Diego, California, on 26 December, arriving 28 December to commence shakedown and training along the California coast. She returned to San Francisco 4 June 1915, then departed 3 October for experimental duty in the Hawaiian Islands. Arriving at Pearl Harbor on 14 October, she conducted torpedo and diving tests and participated in operations developing the tactics of submarine warfare. K-7 departed Pearl Harbor 31 October 1917, and sailed via the West Coast and the Panama Canal for antisubmarine patrol duty in the Gulf of Mexico.

Arriving at Key West, Florida, on 8 January 1918, K-7 patrolled the shipping lanes of the Gulf of Mexico from the Florida Keys to Galveston Bay. She returned to Key West from Galveston, Texas, on 27 November and resumed training and development operations until departing for Philadelphia Navy Yard on 14 April 1919. She received an overhaul from 21 April to 10 November, then resumed operations out of Key West in the Caribbean Sea. Following additional overhaul during the latter half of 1921, K-7 resumed her training and development operations at the United States Naval Academy on 19 January 1921.

For more than two years, she ranged the eastern seaboard from Hampton Roads, Virginia, to Provincetown, Massachusetts, training submariners, conducting diving experiments, and practicing underwater warfare tactics. During April and May 1921, she visited the Naval Academy at Annapolis, Maryland and the United States Military Academy at West Point, New York. After conducting almost seven months of submarine instructions at New London, Connecticut, she arrived at Hampton Roads on 7 September 1922 for submarine flotilla operations in Chesapeake Bay. Subsequently, K-7 decommissioned at Hampton Roads on 12 February 1923. She was towed to Philadelphia on 23 August 1924, struck from the Naval Vessel Register on 18 December 1930, and sold for scrap 3 on June 1931.

Notes

  1. 1.0 1.1 Friedman, p. 307
  2. 2.0 2.1 Gardiner & Gray, p. 128

References

External links