| Career |  |
|---|---|
| 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.
