HMS Dreadnought (S101)

Class overview
Builders	Vickers Armstrongs, Barrow-in-Furness
Operators	Royal Navy
Succeeded by	Valiant class
Built	1959–1960
In commission	1963–1980
History
United Kingdom
Name	HMS Dreadnought
Builder	Vickers Armstrongs, Barrow-in-Furness
Laid down	12 June 1959
Launched	21 October 1960
Commissioned	17 April 1963
Decommissioned	1980
Identification	Pennant number: S101
Fate	Laid up at Rosyth Dockyard
Badge
General characteristics
Class and type	Nuclear-powered submarine
Displacement	3,500 tons surfaced (3,556 tonnes) 4,000 tons submerged (4,064 tonnes)
Length	265.7 ft (81.0 m)
Beam	31.2 ft (9.5 m)
Draught	25.9 ft (7.9 m)
Propulsion	1 x Westinghouse S5W reactor, two geared steam turbines, one shaft, 15,000 shp (11,000 kW)
Speed	20 knots (37 km/h; 23 mph) surfaced; 28 knots (52 km/h; 32 mph) submerged
Complement	113
Armament	6 x bow tubes for 21 inch (533 mm) torpedoes, 24 rounds carried

The seventh Royal Navy ship to be named HMS Dreadnought was the United Kingdom's first nuclear-powered submarine, built by Vickers Armstrongs at Barrow-in-Furness. Launched by Queen Elizabeth II on Trafalgar Day 1960 and commissioned into service with the Royal Navy in April 1963, she continued in service until 1980. The submarine was powered by a S5W reactor, a design made available as a direct result of the 1958 US–UK Mutual Defence Agreement.