HMS Londonderry (F108)

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HMS Londonderry (F 108) off Miami 1964.jpg
HMS Londonderry off Miami, Florida, in 1964
History
Royal Navy EnsignUnited Kingdom
Class and type: Rothesay class frigate
Name: HMS Londonderry
Builder: J. Samuel White, Cowes
Laid down: 15 November 1956
Launched: 20 May 1958
Decommissioned: 29 March 1984
Identification: Pennant number: F108
Motto: Non recedam
Fate: sunk as target, 25 June 1989
General characteristics
Displacement:
  • As built: 2,150 tons standard
  • 2,560 tons full load
  • As modified: 2,380 tons standard
  • 2,800 tons full load
Length: 370 ft (110 m)
Beam: 41 ft (12 m)
Draught: 17.3 ft (5.3 m)
Propulsion:
Speed: 30 knots (56 km/h)
Range: 400 tons oil fuel, 5,200 nautical miles (9,600 km) at 12 knots (22 km/h)
Complement: 152, later 225, modified to 235
Sensors and
processing systems:
  • (as built):
  • Radar Type 293Q target indication. Later Type 993
  • Radar Type 277Q height finding
  • Radar Type 275 fire control on director Mark 6M. Removed as trials ship.
  • Radar Type 974 navigation. Later Type 978
  • Type 1010 Cossor Mark 10 IFF
  • Sonar Type 174 search
  • Sonar Type 162 target classification
  • Sonar Type 170 attack
Armament:
  • (as built):
  • 1 × twin 4.5 in (11.4 cm) gun Mark 6
  • 1 × 40 mm Bofors gun Mark 7
  • 2 × Limbo A/S mortar Mark 10
  • 12 × 21-in A/S torpedo tubes (removed or never shipped)
  • (as modified):
  • 1 × twin 4.5 in (11.4 cm) gun Mark 6
  • 1 × Sea Cat GWS-20 SAM
  • 2 × 20 mm Oerlikon guns
  • 1 × Limbo A/S mortar Mark 10
  • 1 × Westland Wasp HAS.1 helicopter
  • 2 × 8-barrel 3 in Knebworth/Corvus countermeasures launchers?
  • As a trials ship all armament was removed.

HMS Londonderry was a Rothesay or Type 12 class anti-submarine frigate of the British Royal Navy in service from 1960 to 1984.

Design[edit]

The Rothesay-class was an improved version of the Whitby-class anti-submarine frigate, with nine Rothesays ordered in the 1954–55 shipbuilding programme for the Royal Navy to supplement the six Whitbys.[1]

Londonderry was 370 feet 0 inches (112.78 m) long overall and 360 feet 0 inches (109.73 m) between perpendiculars, with a beam of 41 feet 0 inches (12.50 m) and a draught of 13 feet 6 inches (4.11 m).[2] The Rothesays were powered by the same Y-100 machinery used by the Whitby-class. Two Babcock & Wilcox water-tube boilers fed steam at 550 pounds per square inch (3,800 kPa) and 850 °F (454 °C) to two sets of geared steam turbines which drove two propeller shafts, fitted with large (2 feet (0.61 m) diameter) slow-turning propellers. The machinery was rated at 30,000 shaft horsepower (22,000 kW), giving a speed of 29.5 knots (33.9 mph; 54.6 km/h).[3][4] Crew was about 212 officers and men.[2][a]

A twin 4.5-inch (113 mm) Mark 6 gun mount was fitted forward, with 350 rounds of ammunition carried. It was originally intended to fit a twin 40 mm L/70 Bofors anti-aircraft mount aft, but in 1957 it was decided to fit the Seacat anti-aircraft missile instead. Seacat was not yet ready, and Londonderry was completed with a single L/60 40 mm Bofors mount aft as a temporary anti-aircraft armament.[6] The design anti-submarine armament consisted of twelve 21-inch torpedo-tubes (eight fixed and two twin rotating mounts) for Mark 20E Bidder homing anti-submarine torpedoes, backed up by two Limbo anti-submarine mortars fitted aft. The Bidder homing torpedoes proved unsuccessful however, being too slow to catch modern submarines, and the torpedo tubes were soon removed.[7]

The ship was fitted with a Type 293Q surface/air search radar on the foremast, with a Type 277 height-finding radar on a short mast forward of the foremast. A Mark 6M fire control system (including a Type 275 radar) for the 4.5 inch guns was mounted above the ship's bridge, while a Type 974 navigation radar was also fitted.[8][9] The ship's sonar fit consisted of Type 174 search, Type 170 fire control sonar for Limbo and a Type 162 sonar for classifying targets on the sea floor.[9]

Construction[edit]

Londonderry was laid down at J. Samuel White's Cowes, Isle of Wight shipyard on 15 November 1956,[10] and was launched by Cynthia Brooke, Viscountess Brookeborough, wife of Basil Brooke, 1st Viscount Brookeborough, the Prime Minister of Northern Ireland on 20 May 1958.[11] She was completed on 20 July 1960.[10][b]

Modernisation[edit]

From 1967 to 1969 Londonderry underwent a major modernisation, which brought the ship close in capacity to the Leander-class.[16][12] A hangar and flight deck was added aft to allow a Westland Wasp helicopter to be operated, at the expense of one of the Limbo anti-submarine mortars, while a Seacat launcher and the associated GWS20 director was mounted on the hangar roof. Two 20-mm cannons were added either side of the ship's bridge. A MRS3 fire control system replaced the Mark 6M, and its integral Type 903 radar allowed the Type 277 height finder radar to be removed. A Type 993 surface/air-search radar replaced the existing Type 293Q radar, while the ship's defences were enhanced by the addition of the Corvus chaff rocket dispenser.[12][17]

Fleet service[edit]

After commissioning on 20 July 1960, Londonderry completed manufacturer's trials and then was formally taken over by the Royal Navy. She then carried out time in the Home Fleet before departing Portsmouth, Hampshire, UK on 1 May 1961 for her first cruise in the Caribbean area. Between 1961 and 1964 the frigate was deployed four times to the West Indies, also visiting Argentina.[18] In October 1961 she was diverted to assist the Italian liner MV Bianca C when the latter caught fire in the port of St. George's, Grenada.[19] In August 1965 she was present at Portsmouth Navy Days.[20] On 31 August 1965 Londonderry left Portsmouth for service in the Far East. She returned in 1967 and was modernised until 1969 at Rosyth. The most distinctive features of her modernization were the helicopter deck and hangar aft for a Westland Wasp helicopter.[21]

Following her modernization she was sent to Malaysia in 1970. She also took part in the Beira Patrol and was then sent to the Bahamas where she rescued 148 Cuban refugees. In 1973 she replaced Yarmouth in the NATO Standing Naval Force Atlantic.[22]

Trials ship[edit]

Rothesay" Class Type 12M Anti Submarine Frigate "HMS Londonderry" under major conversion to a weapons trials ship with the 4.5-inch gun turret removed, a helicopter pad fitted, and no less than three radar-electronic masts erected (instead of the one as built). At Portsmouth Navy Days, August 1980

In November 1975 she entered the Rosyth Dockyard to be refitted as a trials ship for Admiralty Surface Weapons Establishment. Up to October 1979 Londonderry had her armament removed, and an extra mast added for her new role as a trials ship. The original propellers were replaced and new, low-cavitation propellers were installed. Additional navigational equipment and accommodation were installed to provide berths for both midshipmen from Dartmouth and apprentices from HMS Caledonia who were undergoing sea training.

In early 1982, Londonderry accompanied Fearless on a sea training trip to the West Indies and the United States of America, visiting Virgin Gorda in the British Virgin Islands and New Orleans during the Mardi Gras celebrations. Returning home she was paid off into reserve on 31 March 1982. Originally she should have been put on the disposal list, but due to the Falklands War she became the Dartmouth Training Ship of the 6th Frigate Squadron. From 20 January to 29 March Londonderry made her last cruise from Portsmouth for the Dartmouth Training Squadron's deployment to the West Indies and USA. She then became a Harbour Training Ship attached to the shore base HMS Sultan at Gosport. She remained in this role until 1988. On 25 June 1989 Londonderry was finally sunk as a target off Scotland.[23]

During her service Londonderry steamed approximately 125,500 km, four times crossing the Atlantic and transiting the Panama Canal three times. She visited 50 ports in 35 different countries. Although never deployed in a war the ship's guns fired 1,232 rounds of 4.5-inch ammunition and 442 rounds of 40 mm ammunition.[24]

Notes[edit]

  1. ^ Conway's states the crew of a Rothesay ranged from 200–235,[1] while Jane's Fighting Ships 1962–63 states a crew of 200 (9 officers and 191 ratings)[5]
  2. ^ While Friedman,[10] Marriott[12] and Conways[1] have Londonderry completing on 18 October 1961, Jane's Fighting Ships[5][13][14] say she was completed on 22 July 1960, while a contemporary report in Navy News says she was commissioned on 20 July 1960.[15]

References[edit]

  1. ^ a b c Gardiner & Chumbley 1995, p. 519
  2. ^ a b Friedman 2008, pp. 321–322
  3. ^ Friedman 2008, pp. 206, 208, 322
  4. ^ Marriott 1983, pp. 58, 64
  5. ^ a b Blackman 1962, p. 265
  6. ^ Friedman 2008, pp. 208–209, 322
  7. ^ Marriott 1983, pp. 55, 58
  8. ^ Gardiner & Chumbley 1995, pp. 484, 519
  9. ^ a b Marriott 1983, p. 55
  10. ^ a b c Friedman 2008, p. 337
  11. ^ "H.M.S. Londonderry Launched at Cowes". Navy News. June 1958. p. 8. Retrieved 18 September 2018.
  12. ^ a b c Marriott 1983, p. 58
  13. ^ Blackman 1971, p. 352
  14. ^ Moore 1979, p. 604
  15. ^ "Two fine ships join the Fleet the same day". Navy News. August 1960. p. 1. Retrieved 19 September 2018.
  16. ^ Critchley 1992, pp. 100, 104
  17. ^ Friedman 2008, pp. 208–210
  18. ^ "HMS Londonderry major events of the Commission 1960 - 1962". Retrieved 1 December 2016.
  19. ^ "Royal Navy, including Administration, 1961-1970". Retrieved 1 December 2016.
  20. ^ Programme, Portsmouth Navy Days, 28–30 August 1965, HMSO, p 12
  21. ^ "HMS Londonderry - 1st Home Cruise". Retrieved 1 December 2016.
  22. ^ "HMS Londonderry - What Happened Later". Retrieved 1 December 2016.
  23. ^ Olver, Jeremy (23 January 2003). "Rothesay Class Anti Submarine Frigates (Type 12 Modified)". Archived from the original on 6 June 2007. Retrieved 19 September 2018.
  24. ^ "HMS Londonderry - Statistics". Retrieved 1 December 2016.

Publications[edit]

External links[edit]