Admiral Pereira da Silva-class frigate

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Portuguese frigate Almirante Magalhaes Correia (F474) underway at sea.jpg
Admiral Magalhães Correia underway
Class overview
NameAdmiral Pereira da Silva class
BuildersLisnave - Lisbon ENVC - Viana do Castelo
OperatorsNaval Jack of Portugal.svg  Portuguese Navy
Preceded by Pacheco Pereiraclass
Succeeded by João Beloclass
Built1962–1968
In commission1966–1989
Planned3
Completed3
Retired3
General characteristics
Type Frigate
Displacement1,914  t (1,884 long tons)
Length95.9 m (314 ft 8 in)
Beam11.18 m (36 ft 8 in)
Draught5.33 m (17 ft 6 in)
Propulsion
  • 2 × Foster-Wheeler boilers
  • 1 × De Laval geared turbine
  • 15,000  kW (20,000  shp)
  • 1 shaft
Speed27 knots (50 km/h; 31 mph)
Range3,220  nmi (5,960 km; 3,710 mi) at 15 knots (28 km/h; 17 mph)
Complement166
Sensors and
processing systems		 Mark 63 fire-control system
Armament

The Admiral Pereira da Silva class of frigates, also known as Admiral-class frigates, were in the service of the Portuguese Navy between 1966 and 1985. The class was based on the Dealey-class destroyer escort of the United States Navy. The three ships of the class were built in Portugal, at the Lisnave shipyards and the shipyards of Viana do Castelo. The construction of the ships was part of the effort of Portugal to expand its fleet in the face of unrest in the empire and was financed by the United States via the Mutual Defense Assistance Program. Financial problems prevented them from ever being modernised and they were deleted in 1989.

Contents

Design and description

By the 1960s, Portugal retained an extensive empire and the vast majority of the Portuguese Navy's warships were dedicated to patrolling its waters. However, in that decade the empire saw unrest and invasion and the navy was expanded to meet those threats. Three ships were ordered from Portuguese shipyards to a modified design of the American Dealey-class destroyer escorts. [1] They were funded in the United States as hulls DE-1039, DE-1042 and DE-1046 under the Mutual Defense Assistance Program. [2] [3] The vessels were modified for service in tropical climates for service within the empire. [2] Rated as frigates by the Portuguese Navy, they measured 95.9 metres (314 ft 8 in) long overall with a beam of 11.18 m (36 ft 8 in) and a standard draught of 4.3 m (14 ft 1 in) and a maximum draught of 5.33 m (17 ft 6 in). The frigates had a standard displacement of 1,450 tonnes (1,430 long tons ) and 1,914 t (1,884 long tons) at full load. [4] They had a complement of 166 including 12 officers. [2] [4]

The Admiral Pereira da Silva-class ships were propelled by a propeller on a single shaft turned by a De Laval geared turbine creating 15,000 kilowatts (20,000  shp ). It was powered by steam from two Foster-Wheeler boilers creating 2,100 kilopascals (300  psi ) of pressure at 454 °C (850 °F). This gave the frigates a maximum speed of 27 knots (50 km/h; 31 mph). They carried 400 t (390 long tons; 440 short tons) of fuel oil giving them a range of 3,220 nautical miles (5,960 km; 3,710 mi) at 15 knots (28 km/h; 17 mph). [2]

The vessels were primarily designed for anti-submarine warfare (ASW). [5] They were armed with two twin-mounted 3-inch (76 mm)/50-caliber dual-purpose guns, with one turret forward and one aft. [lower-alpha 1] In the "B" position forward, the frigates mounted two four-barrelled Bofors 375 mm (14.75 in) anti-submarine rocket launchers. [2] [4] The Admiral Pereira da Silvas also mounted two depth charge throwers and two triple 324 mm (12.75 in) Mk 32 ASW torpedo tubes for Mark 44 torpedoes. [2] [6]

Admiral Pereira da Silva-class frigates were equipped with Mark 63 fire-control systems. They were also fitted with MLA-1B search, Type 978 tactical and SPG-34 fire control radars. Th three ships of the class were equipped with different sonar to reduce frequency interference. Admiral Pereira da Silva was given SQS-30, Admiral Gago Coutinho was given SQS-31 and Admiral Magalhães Correia was given SQS-31. All three vessels mounted SQA-10A variable depth sonar and DUBA-38 sonar. [2] [3]

Ships

Admiral Pereira da Silva class construction data [2]
Pennant numberShip nameBuilderLaid downLaunchedCommissionedFate
F 472 Admiral Pereira da Silva Lisnave14 June 19622 December 196320 December 1966Deleted 1989
F 473 Admiral Gago Coutinho 2 December 196313 August 196529 November 1967
F 474 Admiral Magalhães Correia Viana do Castelo30 August 196326 April 19654 November 1968

Construction and career

All three ships were constructed in Portugal. [2] After they entered service, the Portuguese Empire was disassembled beginning in the 1970s and the Portuguese economy suffered as a result. This prevented the ships from ever receiving their planned refits and saw maintenance issues increase over their careers. [1] [7] They were intended to be replaced by Dutch Kortenaer-classfrigates but Portugal acquired the Vasco da Gama-classfrigates instead. [8] [9]

See also

Notes

  1. ↑ In United States Navy gun nomenclature, the "/50 caliber" denotes the length of the gun. In this case, the /50 gun is 50 caliber, meaning that the gun barrel is 50 times as long as it is in diameter.

Citations

  1. 1 2 Lyon & Chumbley 1995, pp. 317–318.
  2. 1 2 3 4 5 6 7 8 9 Lyon & Chumbley 1995, p. 318.
  3. 1 2 Couhat 1986, p. 395.
  4. 1 2 3 Blackman 1972, p. 270.
  5. ↑ Friedman 1995, p. 595.
  6. ↑ Couhat 1976, p. 314.
  7. ↑ Moore 1982, p. 371.
  8. ↑ Lyon & Chumbley 1995, p. 320.
  9. ↑ Moore 1982, p. 370.

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References


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