 | |
| Class | Porpoise |
| Type | Attack Submarine |
| Year | 1958 |
| Crew | 71 |
| Dimensions | |
| Length | 73.4 m (pp) 88.4 m |
| Beam | 8.1 m |
| Draught | 5.6 m |
| Displacement | |
| Empty | 1,565 t |
| Surfaced | 1,975 t |
| Submerged | 2,303 t |
| Performance | |
| Speed | 22 km/h / 31 km/h |
| Range | 16,668 km @ 22 km/h |
| Depth | 200 m |
| Machinery | |
| Shafts | 2 |
| Turbines | 2 x Diesel engine 3,680 hp ASR 1 2 x Electric motor 6,000 hp English Electric |
| Fuel | Oil: 258 t |
| Armament | |
| Torpedo tubes | 6 x 533-mm (2 x 3) [Fwd] 2 x 533-mm (2 x 1) [Aft] |
| Armor | |
| Armor | None |
| Sensors | |
| Sonar | Type 187 Type 2007 Type 2019 |
| Production | |
| Built | 8 |
| Total | 8 |
| Ship | Code | Builder | Laid | Launch | Comm | Decomm | Fate | ||
|
Porpoise | S01 | Vickers-Armstrong | 15/06/1956 | 25/04/1956 | 16/04/1958 | 1982 | Sunk as target | |
|
Rorqual | S02 | Vickers-Armstrong | 15/01/1955 | 05/12/1956 | 24/10/1958 | 1977 | Sold/Scrapped | |
|
Narwhal | S03 | Vickers-Armstrong | 15/03/1956 | 25/10/1957 | 04/05/1959 | 1983 | Sold/Scrapped | |
|
Grampus | S04 | Cammell Laird | 16/04/1955 | 30/05/1957 | 19/12/1958 | 1980 | Sunk as target | |
|
Finwhale | S05 | Cammell Laird | 18/09/1956 | 21/07/1959 | 19/08/1960 | 1979 | Sold/Scrapped | |
|
Cachalot | S06 | Scotts | 01/08/1955 | 11/12/1957 | 01/09/1959 | 1979 | Sold/Scrapped | |
|
Sealion | S07 | Cammell Laird | 05/06/1958 | 31/12/1959 | 25/07/1961 | 12/1987 | Sold/Scrapped | |
|
Walrus | S08 | Scotts | 12/02/1958 | 22/09/1959 | 08/02/1961 | 1987 | Sold/Scrapped |
