HMS Excalibur

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Career Royal Navy Ensign
Name: HMS Excalibur
Ordered: 1947-08-26
Launched: 1955-02-25
Completed: 1958-02-22
Fate: Scrapped 1968
General characteristics
Displacement: 780 tons surfaced
1,000 tons submerged
Length: 178 ft (54 m)
Beam: 15 ft 8 in (4.8 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 (46.3 km/h) (submerged)
Complement: 49
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 by the Royal Navy.

For details of the decisions leading to their construction, and problems affecting the vessels, please refer to the article on HMS Explorer.