HMS Excalibur

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Career Royal Navy Ensign
Ordered: August 26 1947
Laid down: na
Launched: February 25 1955
Completed: February 22 1958
Commissioned: na
Decommissioned: na
Fate: Scrapped 1968
Struck: na
General Characteristics
Displacement: 780 tons surfaced

1,000 tons submerged

Length: 178 feet (54.3 m)
Beam: 15.7 feet (4.8 m)
Draught: 11 feet (3.4 m)
Propulsion: Submerged - High Test Peroxide (HTP) steam raising plant driving steam turbines, directly to twin shafts.

Surfaced - diesel electric.

Speed: maximum 25 knots (46.3 km/h) dived
Range: na
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.