Dealey-class destroyer escort

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

USS Dealey (DE-1006)
Class overview
Operators:
Preceded by: John C. Butler class
Succeeded by: Claud Jones class
Subclasses:
Built: 1952–1957
In commission: 1954–1994
Completed: 13
Preserved: 1
General characteristics
Type: Destroyer escort
Displacement: 1,270 long tons (1,290 t)
Length: 314 ft 6 in (95.86 m)
Beam: 36 ft 9 in (11.20 m)
Draft: 18 ft (5.5 m)
Propulsion:
  • 2 × Foster-Wheeler boilers
  • 1 × De Laval geared turbine
  • 20,000 shp (15 MW)
  • 1 shaft
Speed: 25 knots (29 mph; 46 km/h)
Complement: 170
Armament:

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-71, or the Dealey or DE-1006 class,[3][lower-alpha 1] 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.[5] 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).[5][lower-alpha 2] 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][5]

As built, the ships had a gun armament of two twin 3-inch (76 mm)/50 calibre guns, mounted fore and aft. 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][5] Sensors included the SPS-6 air-search radar and the SQS-4 low-frequency sonar.[6]

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 Jones class being built. The Dealey design formed the basis for the Norwegian Oslo-class and Portuguese Admiral Pereira da Silva-class frigates.[7][8]

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.[5][9]

Ships
Name Number Builder Laid down[10] Launched[10] Commissioned[10] Fate
Dealey DE-1006 Bath Iron Works 15 December 1952 8 November 1953 3 June 1954 Transferred to Uruguay as ROU 18 De Julio (DE-3)
Cromwell DE-1014 Bath Iron Works 3 August 1953 4 June 1954 24 November 1954 Stricken 5 July 1972
Hammerberg DE-1015 Bath Iron Works 12 November 1953 20 August 1954 2 March 1955 Stricken 14 December 1973
Courtney DE-1021 Defoe Shipbuilding 2 September 1954 2 November 1955 24 September 1956 Stricken 1973
Lester DE-1022 Defoe Shipbuilding 2 September 1954 5 January 1956 14 June 1957 Stricken 1973
Evans DE-1023 Puget Sound Bridge and Dredging 8 April 1955 14 September 1955 14 June 1957 Stricken 1973
Bridget DE-1024 Puget Sound Bridge and Dredging 19 September 1955 25 April 1956 24 October 1957 Stricken 1973
Bauer DE-1025 Bethlehem Steel, Alameda Shipyard 1 December 1955 4 June 1957 21 November 1957 Stricken 1973
Hooper DE-1026 Bethlehem Steel, Alameda Shipyard 4 January 1956 1 August 1957 18 March 1958 Stricken 1973
John Willis DE-1027 New York Shipbuilding 5 July 1955 4 February 1956 21 February 1957 Stricken 1972
Van Voorhis DE-1028 New York Shipbuilding 29 August 1955 28 July 1956 22 April 1957 Stricken 1972
Hartley DE-1029 New York Shipbuilding 31 October 1955 24 November 1956 26 June 1957 Sold to Colombia as ARC Boyaca (DE-16) 1972, Preserved in Colombia
Joseph K. Taussig DE-1030 New York Shipbuilding 3 January 1956 3 January 1957 10 September 1957 Stricken 1972

Notes
  1. SCB stands for the Ship Characteristics Board, part of the US Navy tasked with drawing up requirements for new ships and modifications to existing ships. Each design project was assigned an SCB number.[4]
  2. 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. Friedman 1982, p. 274
  4. Friedman 1982, p. 3
  5. Gardiner & Chumbley 1995, p. 595
  6. Gardiner & Chumbley 1995, pp. 558–559, 595
  7. Friedman 1982, p. 275
  8. Gardiner & Chumbley 1995, pp. 318, 595–596
  9. Friedman 1982, p. 290
  10. Blackman 1971, p. 486
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References
  • Blackman, Raymond V. B. (1971). Jane's Fighting Ships 1971–72. London: Sampson Low Marston & Co. Ltd.CS1 maint: ref=harv (link)
  • Friedman, Norman (1982). U.S. Destroyers: An Illustrated Design History. Annapolis, Maryland, USA: Naval Institute Press. ISBN 0-87021-733-X.CS1 maint: ref=harv (link)
  • Gardiner, Robert; Chumbley, Stephen, eds. (1995). Conway's All The World's Fighting Ships 1947–1995. Annapolis, Maryland, USA: Naval Institute Press. ISBN 1-55750-132-7.CS1 maint: ref=harv (link)


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