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Swiftsure-class submarine
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{{Short description|1973 class of British nuclear submarines}} {{Use dmy dates|date=January 2020}} {|{{Infobox ship begin}} {{Infobox ship image |Ship image=HMS Spartan Leaves Faslane MOD 45138100.jpg |Ship image size=280px |Ship caption=HMS ''Spartan'' in 1993 }} {{Infobox ship class overview |Name=''Swiftsure'' class |Builders=[[Vickers Shipbuilding and Engineering|Vickers Shipbuilding and Engineering Ltd. (VSEL)]] |Operators={{navy|United Kingdom}} |Class before={{sclass|Churchill|submarine|4}} |Class after={{sclass|Trafalgar|submarine|4}} |Subclasses= |Cost= |Built range= |In service range= |In commission range=17 April 1973 β 10 December 2010 |Total ships building= |Total ships planned= |Total ships completed=6 |Total ships cancelled= |Total ships active= |Total ships laid up= |Total ships lost= |Total ships retired=6 |Total ships preserved= }}{{Infobox ship characteristics |Hide header= |Header caption= |Ship type=[[Submarine]] |Ship displacement= *{{convert|4400|t|ST|2|abbr=on}} standard * {{convert|4900|t|ST|2|abbr=on}} submerged |Ship length={{convert|82.9|m|ft|abbr=on}} |Ship beam={{convert|9.8|m|ft|abbr=on}} |Ship height= |Ship draught={{convert|8.5|m|ft|abbr=on}} |Ship draft= |Ship power= |Ship propulsion=[[Nuclear Reactor]] |Ship speed=In excess of {{convert|28|kn|km/h}} when dived |Ship range=Unlimited (nuclear) |Ship endurance= |Ship test depth= |Ship complement=116 (13 officers) |Ship sensors=Bow, flank, active intercept, and [[towed array sonar]], periscopes (attack and search), collision avoidance radar |Ship EW= |Ship armament= *5 x [[British 21 inch torpedo|21 inch (533 mm)]] torpedo tubes **[[Spearfish torpedo]]es **RN [[Sub Harpoon missile]]s (until c.2004)<ref>{{cite web|url=https://publications.parliament.uk/pa/cm200001/cmhansrd/vo010129/text/10129w19.htm|title=House of Commons Hansard Written Answers for 29 Jan 2001 (pt 19)|access-date=19 December 2014}}</ref> **[[Tomahawk (missile family)|Tomahawk missile]]s (not all fitted) |Ship notes= }} |} The '''''Swiftsure'' class''' was a class of [[Nuclear submarine|nuclear-powered]] [[fleet submarine]]s in service with the [[Royal Navy]] from the early 1970s until 2010. Six boats were built and commissioned. [[HMS Swiftsure (S126)|''Swiftsure'']] was decommissioned in 1992 due to damage suffered to her pressure hull during trials. {{HMS|Splendid|S106|2}} followed in 2004 after defence cuts caused a reduction in the size of the Royal Navy submarine fleet. {{HMS|Spartan|S105|2}} was decommissioned in January 2006, with {{HMS|Sovereign|S108|2}} following on 12 September 2006. {{HMS|Superb|S109|2}} was decommissioned on 26 September 2008. The remaining boat in the class, {{HMS|Sceptre|S104|2}}, was decommissioned in December 2010.<ref>{{cite web|url=https://publications.parliament.uk/pa/cm200809/cmhansrd/cm090303/text/90303w0014.htm|title=House of Commons Hansard Written Answers for 03 Mar 2009 (pt 0014)|access-date=19 December 2014}}</ref> The six boats of the class were not replaced, although the seven boats of the successor [[Trafalgar-class submarine|''Trafalgar''-class submarines]] are in the process of being replaced by seven boats of the [[Astute-class submarine|''Astute''-class submarines]]. A few were upgraded with the capability to launch [[Tomahawk (missile family)|Tomahawk]] cruise missiles in addition to their original armaments of [[torpedo]]es, [[Naval mine|mines]] and anti-ship missiles. They were also the first class of Royal Navy submarines to be built with shrouded [[pump-jet]] [[propulsor]]s.<ref name=Hoolp184/>
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