Churchill class submarine

Churchill-class submarine HMS Conqueror
Class overview
Builders:	Vickers Shipbuilding and Engineering Ltd
Operators:	Royal Navy
Preceded by:	Valiant class submarine
Succeeded by:	Swiftsure class submarine
In service:	1970s - 1990s
Completed:	3
Retired:	3
General characteristics
Displacement:	4,900 tonnes
Length:	86.9 m
Beam:	10.1 m
Draught:	8.2 m
Propulsion:	One nuclear reactor, one shaft
Speed:	28 knots (52 km/h) submerged
Range:	Unlimited, except by food supplies
Complement:	103
Armament:	6 x 533 mm tubes capable of firing: Mark 8 torpedoes Tigerfish torpedoes RN Sub Harpoon Missiles

The three Improved Valiant class submarines, sometimes known as the Churchill class,^[1] were nuclear powered fleet submarines (SSN) which served with the Royal Navy from the 1970s until the early 1990s. The Churchill class was based on the older Valiant class, but featured many internal improvements; they were contemporaries of the US Sturgeon class.

The lead ship was named after the former British Prime Minister and First Lord of the Admiralty Winston Churchill. HMS Conqueror was the most famous of the class, sinking the Argentinian cruiser ARA General Belgrano during the 1982 Falklands War. She is^[update] the only nuclear-powered submarine of any nationality to have engaged an enemy ship with torpedoes.

Design

The Churchills carried a crew of 103 and had a full load displacement of 4,900 tons whilst dived. They were 86.9 metres long, had a beam of 10.1 metres and a draught of 8.2 metres. Their single pressurized water-cooled reactor supplied steam to two English Electric geared turbines, producing a total of 20,000 shp (15,000 kW) for the single shaft and resulting in a maximum of 28 knots submerged. One Kelvin Type 1006 surface-search radar was fitted. The ships were built with a Type 2001 sonar array, but this was replaced in the late 1970s with a Type 2020 array and a Type 2026 towed array. Weapons included Mark 8 torpedoes, Mark 24 Tigerfish torpedoes, and Sub-Harpoon anti-ship missiles. Six 21-inch (533 mm) torpedo tubes fired from the bow.

Like all nuclear-powered submarines the Churchill class could remain submerged almost indefinitely, with supplies of food being the only limiting factor.

HMS Churchill evaluated both the American Mark 48 torpedo and the UGM-84 Harpoon missile, though only the latter was adopted by the Royal Navy. She was decommissioned in 1990 and is laid up at Rosyth awaiting disposal.

In 1981 HMS Courageous became the first British submarine to carry the Sub-Harpoon missile. She was decommissioned in 1992 and is at Devonport Dockyard serving as a museum ship.

Construction Programme

Pennant	Name	(a) Hull builder (b) Main machinery manufacturers	Ordered	Laid down	Launched	Accepted into service	Commissioned	Decommisioned	Estimated building cost[2]
S46	Churchill	(a) Vickers Ltd, Shipbuilding Group, Barrow-in-Furness (b) Vickers Ltd, Engineering Group, Barrow-in-Furness (b) English Electric Co Ltd (turbines).[3]	21 October 1965 [4]	30 June 1967 [5]	20 December 1968 [5]	July 1970 [3]	15 July 1970 [5]	28 February 1991	£24,780,000 [3]
S48	Conqueror	(a) Cammell Laird & Co (Shipbuilders and Engineers) Ltd, Birkenhead (b) Vickers Ltd, Engineering Group, Barrow-in-Furness (b) English Electric Co Ltd (turbines).[6]	9 August 1966 [4]	5 December 1967 [5]	28 August 1969 [5]	November 1971 [6]	9 November 1971 [5]	2 August 1990	£29,319,000 [6]
S50	Courageous (ex-Superb)[5]	(a) Vickers Ltd, Shipbuilding Group, Barrow-in-Furness (b) Vickers Ltd, Engineering Group, Barrow-in-Furness (b) English Electric Co Ltd (turbines).[6]	1 March 1967 [4]	15 June 1968 [5]	7 March 1970 [5]	November 1971 [6]	16 October 1971 [5]	10 April 1992	£24,858,000 [6]

Service history

HMS Conqueror was the most famous of the class, sinking the Argentinian cruiser ARA General Belgrano during the 1982 Falklands War. She did not fire again during the war, but provided valuable help to the British task force by using her monitoring equipment to track Argentine aircraft departing the mainland. After the war Conqueror returned to Faslane; the sinking of the Belgrano had provoked controversy in Britain and Conqueror was criticised for flying the Jolly Roger on returning to port, as Royal Navy submarines customarily did on returning after scoring a kill. She is^[update] the only nuclear-powered submarine of any nationality to have engaged an enemy ship with torpedoes. She was decommissioned in 1990 and as of 2010^[update] is laid up at Devonport awaiting disposal. Conqueror's periscope can be viewed at the Royal Navy's museum in Portsmouth.^[7]

See also

List of submarines of the Royal Navy

Cited footnotes

1. ^ Hool, Jack, and Nutter, Keith, Damned Un-English Machines, a history of Barrow-built submarines, pub Tempus, 2003, ISBN 0-7524-2781-4 page 177.
2. ^ "Unit cost, i.e. excluding cost of certain items (e.g. aircraft, First Outfits)." Text from Defences Estimates
3. ^ ^{a b c} Defence Estimates, 1971-72, page XII-81, Table V: List and particulars of new ships which have been accepted or are expected to be accepted into HM service during the Financial Year ended 31st March 1971
4. ^ ^{a b c} Moore, John, Janes Fighting Ships 1982-83, pub Jane's Publishing, 1982, ISBN 0-7106-0742-3 page 547.
5. ^ ^{a b c d e f g h i j} Gardiner, Robert Conway's All the World's Fighting Ships 1947-1995, pub Conway Maritime Press, 1995, ISBN 0-85177-605-1 page 530.
6. ^ ^{a b c d e f} Defence Estimates, 1972-73, page XII-92, Table V: List and particulars of new ships which have been accepted or are expected to be accepted into HM service during the Financial Year ended 31st March 1971
7. ^ Kemp, Paul (2006). Submarine action. Sutton, p. 68. ISBN 0750917113