Dealey-class destroyer escort

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USS Dealey (DE-1006) underway in the Atlantic Ocean on 28 May 1954.jpg
USS Dealey (DE-1006)
Class overview
Operators
Preceded by John C. Butlerclass
Succeeded by Claud Jonesclass
Subclasses
Built19521957
In commission19541994
Completed13
Preserved1
General characteristics
Type Destroyer escort
Displacement1,314 long tons (1,335  t) light, 1,877 long tons (1,907 t) full load
Length314 ft 6 in (95.86 m)
Beam36 ft 9 in (11.20 m)
Draft18 ft (5.5 m)
Propulsion
  • 2 × Foster-Wheeler boilers
  • 1 × De Laval geared turbine
  • 20,000 shp (15 MW)
  • 1 shaft
Speed25 knots (29 mph; 46 km/h)
Complement170
Sensors and
processing systems
Mark 63 fire-control system
Armament

The Dealey-class destroyer escorts were the first post-World War II escort ships built for the United States Navy.

Contents

Slightly faster and larger than the escort destroyers they succeeded, the Dealey class were fitted with twin-mounted 3-inch (76 mm) guns, anti-submarine (ASW) rockets, a depth charge rack and six depth charge launchers. There were later modernizations that removed the ASW rockets and the depth charges in favor of nuclear-capable anti-submarine rocket launchers and torpedo mounts which fired lighter homing torpedoes. A large SQS 23 sonar was refitted in a bow sonar dome and most of the class were also fitted with a hangar and landing pad for DASH drone helicopters to deliver MK 44 and Mk 46 torpedoes. The drone helicopters proved very unreliable and their failure contributed to the relatively short life of the class.

They were decommissioned in 1972 and 1973 in favor of the Knox-class frigate. Dealey and Hartley were sold at surplus to other countries in 1972, with the remainder of the class being sold for scrap.

Development and design

In the late 1940s, the US Navy developed a requirement for a replacement for the PC-461-class submarine chaser in the coastal convoy escort and patrol roles. The existing submarine chasers were considered too small to carry the required anti-submarine weapons and sensors, and too slow to catch modern submarines, with a ship the size of existing destroyer escorts required. The ships would need to be cheap and quick to build, as large numbers would be required in the event of a war. [1] By 1950, the requirement had changed to an "Ocean Escort" with a speed of at least 25 knots (46 km/h; 29 mph) at full load and an endurance of 6,000 nautical miles (11,000 km; 6,900 mi) at 12 knots (22 km/h; 14 mph). An ahead-throwing anti-submarine weapon, at first planned to be the Mark 17, a large, trainable Hedgehog anti-submarine spigot mortar, would be fitted. [2]

The final design, SCB 72, or the Dealey or DE-1006 class, [3] was 315 feet (96.0 m) long overall and 308 feet (93.9 m) at the waterline, with a beam of 36 feet 8 inches (11.18 m) and a draft of 11 feet 10 inches (3.61 m). Displacement was 1,314 long tons (1,335  t ) light and 1,877 long tons (1,907 t) full load. [4] 2 Foster-Wheeler boilers fed steam to a geared steam turbine, which drove a single propeller shaft. The machinery was rated at 20,000 shaft horsepower (15,000 kW) which gave a design speed of 27 knots (50 km/h; 31 mph). [4] [lower-alpha 1] A single-shaft machinery layout was chosen to ease mass production, avoiding potential bottlenecks in gear-cutting which had delayed production of wartime destroyer escorts. [3] [4]

As built, the ships had a gun armament of two twin 3-inch (76 mm)/50 calibre guns, mounted fore and aft. These were open, manually trained dual-purpose mounts which could be used against both surface and anti-aircraft targets. The Mark 17 Hedgehog was cancelled before the ships were built, so in its place two British Squid anti-submarine mortars were fitted ahead of the ship's bridge in Dealey, with a RUR-4 Weapon Alpha anti-submarine rocket launcher fitted in the remaining ships of the class. Launchers for anti-submarine torpedoes were fitted, and depth charge throwers were fitted on the ships' fantail. [3] [4] Sensors included the SPS-6 air-search radar and the SQS-4 low-frequency sonar. [5]

The prototype ship, Dealey, was built under the Fiscal year (FY) 1952 shipbuilding program, with two ordered in both the FY 1953 and 1954 programs and eight in the 1955 program. Production was stopped at 13 because the Dealey class was considered too expensive at $12 million for mass production. This resulted in the smaller, diesel-powered Claud Jonesclass being built. The Dealey design formed the basis for the Norwegian Oslo-class and Portuguese Admiral Pereira da Silva-class frigates. [6] [7]

Modifications

All of the class except Dealey, Cromwell and Courtney were upgraded in the 1960s by adding facilities for the DASH drone helicopter, with a hangar and helicopter deck replacing the aft 3-inch gun mount and the longer-ranged SQS-23 sonar replaced the SQS-4. The three unmodified ships were fitted with a Variable Depth Sonar (VDS). All ships had their Squid or Weapon Alpha launchers removed late in their US Navy career, while Mark 32 torpedo tubes for Mark 44 or Mark 46 anti-submarine torpedoes were fitted. [4] [8]

Ships

NameNumberBuilderLaid down [9] Launched [9] Commissioned [9] Fate
Dealey DE-1006 Bath Iron Works 15 December 19528 November 19533 June 1954Transferred to Uruguay as ROU 18 De Julio (DE-3)
Cromwell DE-1014Bath Iron Works3 August 19534 June 195424 November 1954Stricken 5 July 1972
Hammerberg DE-1015Bath Iron Works12 November 195320 August 19542 March 1955Stricken 14 December 1973
Courtney DE-1021 Defoe Shipbuilding 2 September 19542 November 195524 September 1956Stricken 1973
Lester DE-1022Defoe Shipbuilding2 September 19545 January 195614 June 1957Stricken 1973
Evans DE-1023 Puget Sound Bridge and Dredging 8 April 195514 September 195514 June 1957Stricken 1973
Bridget DE-1024Puget Sound Bridge and Dredging19 September 195525 April 195624 October 1957Stricken 1973
Bauer DE-1025 Bethlehem Steel, Alameda Shipyard 1 December 19554 June 195721 November 1957Stricken 1973
Hooper DE-1026Bethlehem Steel, Alameda Shipyard4 January 19561 August 195718 March 1958Stricken 1973
John Willis DE-1027 New York Shipbuilding 5 July 19554 February 195621 February 1957Stricken 1972
Van Voorhis DE-1028New York Shipbuilding29 August 195528 July 195622 April 1957Stricken 1972
Hartley DE-1029New York Shipbuilding31 October 195524 November 195626 June 1957Sold to Colombia as ARC Boyaca (DE-16) 1972, Preserved in Colombia
Joseph K. Taussig DE-1030New York Shipbuilding3 January 19563 January 195710 September 1957Stricken 1972

Notes

  1. Dealey reached a speed of 27.58 knots (51.08 km/h; 31.74 mph) during sea trials. [3]

Citations

  1. Friedman 1982 , pp. 270, 272–273
  2. Friedman 1982 , pp. 273–274
  3. 1 2 3 4 Friedman 1982 , p. 274
  4. 1 2 3 4 5 Gardiner & Chumbley 1995 , p. 595
  5. Gardiner & Chumbley 1995 , pp. 558–559, 595
  6. Friedman 1982 , p. 275
  7. Gardiner & Chumbley 1995 , pp. 318, 595–596
  8. Friedman 1982 , p. 290
  9. 1 2 3 Blackman 1971 , p. 486

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