Sturgeon-class submarine

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Class overview
NameSturgeon class
Builders
Operators United States Navy
Preceded by
Thresher/Permit class
Succeeded byLos Angeles class
SubclassesLong-hull variant (9 boats)
Built1963–1975
In commission1967–2004
Completed37 (+1 modified variant for experimental research)
Retired37 (+1)
General characteristics
TypeNuclear-powered attack submarine
Displacement
  • 3,640 long tons (3,698 t) surfaced
  • 4,640 long tons (4,714 t) submerged[1]
Length
  • Short hull: 292 ft 3 in (89.08 m)
  • Long hull: 302 ft 3 in (92.13 m)
Beam31 ft 8 in (9.65 m)
Draft24 ft 5 in (7.44 m)[1]
Propulsion
Speed
  • 15 knots (28 km/h; 17 mph) surfaced
  • 26 knots (48 km/h; 30 mph) submerged
RangeUnlimited, except by food supplies
Test depth1,320 ft (400 m)[2]
Complement107
Armament
  • 4 ×
    SUBROC
    anti-submarine missiles
  • In minelaying configuration:
  • CAPTOR mines
    instead of torpedoes.

The Sturgeon class (known colloquially in naval circles as the 637 class) was a class of nuclear-powered fast attack submarines (SSN) in service with the United States Navy from the 1960s until 2004. They were the "workhorses" of the Navy's attack submarine fleet throughout much of the Cold War. The boats were phased out in the 1990s and early 21st century, as their successors, the Los Angeles, followed by the Seawolf and Virginia-class boats, entered service.

Design

Control room

The Sturgeons were essentially lengthened and improved variants of the

fairwater planes mounted on the sail could rotate 90 degrees, allowing the submarine to surface through thin ice.[1] Because the S5W reactor was used (the same as in the Skipjacks and Thresher/Permits), the sail was enlarged (increasing drag
), and the displacement was increased, the Sturgeons' top speed was 26 knots (48 km/h), 2 knots slower than the Thresher/Permits. The last nine Sturgeons were lengthened 10 feet (3 m) to provide more space for electronic equipment and habitability. The extra space also helped facilitate the use of dry deck shelters first deployed in 1982.

The class received mid-life upgrades in the 1980s, including the BQQ-5 sonar suite with a retractable towed array, Mk 117 torpedo fire control equipment, and other electronics upgrades.

USS Pargo (SSN-650) surfaced in Arctic ice.

Armament

The Sturgeon-class boats were equipped to carry the

SUBROC, the Mark 67 SLMM and Mark 60 CAPTOR mines, and the MK-48 and ADCAP torpedoes. Torpedo tubes were located amidships to accommodate the bow-mounted sonar. The bow covering the sonar sphere was made from steel or glass reinforced plastic (GRP), both varieties having been produced both booted and not booted. Booted domes are covered with a half-inch layer of rubber.[3][4]
The GRP domes improved the bow sonar sphere performance; though for intelligence gathering missions, the towed-array sonar was normally used as it was a much more sensitive array.

Noise reduction

Several Sturgeon boats and related submarines were modifications of the original designs to test ways to reduce noise.

  • Puffer was outfitted with Raytheon Harmonic Power Conditioners which eliminated an electrical bus noise problem that was inherent in the class. This was done by harmonic conditioning of the power system. This successful feature was later outfitted on the entire class.
  • Batfish and Bluefish among others were outfitted with SHT (Special Hull Treatment) during a non-refueling overhaul, which reduced noise and the submarine sonar profile.
  • a turbo-electric system for main propulsion rather than a reduction gear drive from the steam turbines. The massive motor and associated generators required her to be lengthened to 365 ft 0 in (111.25 m). The Lipscomb's trial of turbo-electric propulsion was not considered successful due to lower speed - top speed was 23 knots (43 km/h), 5 knots slower than the Thresher/Permits - and a lack of reliability, and she was decommissioned in 1989.[1]
  • natural circulation S5G reactor and a direct-drive turbine, along with several other quieting features. Unlike the Sturgeon class, the Narwhal did not fully comply with SUBSAFE regulations due to her unique main seawater system.[5]

Variants

Beginning with Archerfish, units of this class had a 10-foot (3.0 m) longer hull, giving them more living and working space than previous submarines. Parche received an additional 100-foot (30 m) hull extension containing cable tapping equipment that brought her total length to 401 feet (122 m). A number of the long hull Sturgeon-class SSNs, including Parche, L. Mendel Rivers, and Richard B. Russell were involved in top-secret reconnaissance missions, including cable tap operations in the Barents and Okhotsk seas. Parche received nine Presidential Unit Citations for successful missions.[6]

A total of seven boats were modified to carry the

lockout chamber attached to the ship's midships weapons shipping hatch, facilitating the use of SEAL Delivery Vehicles
. DDS-equipped boats were tasked with the covert insertion of special forces.

Boats in class

Main article: List of Sturgeon-class submarines

From Register of Ships of the US Navy, 1775-1990.[7]

Short hull

Long hull

Derivatives

One other Navy vessel was based on the Sturgeon hull, but was modified for experimental reasons:

See also

References

Citations

  1. ^ a b c d e f Friedman, pp 144–149, 243
  2. ^ Tyler, Patrick (1986). Running Critical. New York: Harper and Row. p. 58.
  3. ^ Pike, John. "Sonar Domes". Military. GlobalSecurity.org. Retrieved 17 May 2011.
  4. ^ "Coating Systems for Submarine Bow Dome Preservation". National Surface Treatment Center. Archived from the original on 9 October 2011. Retrieved 17 May 2011.
  5. ^ Friedman, pp 143–149
  6. ISBN 0-06097-771-X
    .
  7. ISBN 0-313-26202-0
    .

Sources
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