HMS Excalibur

	HMS Excalibur (S40)
History
United Kingdom
Name	Excalibur
Ordered	26 August 1947
Builder	Vickers Armstrong
Launched	25 February 1955
Completed	22 February 1958
Identification	Pennant number: S40
Nickname(s)	The Excruciator
Fate	Scrapped, 1968
Notes	Built at a cost of £1,142,000
General characteristics
Class and type	Explorer-class submarine
Displacement	780 long tons (790 t) (surfaced); 1,000 long tons (1,000 t) (submerged);
Length	178 ft (54 m)
Beam	15 ft 8 in (4.78 m)
Draught	11 ft (3.4 m)
Propulsion	High Test Peroxide (HTP) steam raising plant driving steam turbines (submerged); Diesel-electric (surfaced); 2 shafts;
Speed	25 knots (46 km/h; 29 mph) (submerged)
Complement	41
Armament	None

HMS Excalibur was the sister ship of HMS Explorer, the two submarines being the only high-test peroxide (HTP) powered submarines to be constructed for the Royal Navy. She is the only ship to be named as such, in honour of the sword of Arthurian legend.

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