Porpoise Class

Overseas Patrol Submarine
Later Classified as Attack Submarine (SSK)

  • Porpoise Class Submarine
  • Cachalot
  • Finwhale
  • Narwhal
  • Porpoise
  • Rorqual
  • Sealion
  • Walrus
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The 'Porpoise' class submarine were the first attack submarine designed after the Second World War to be accepted into service with the Royal Navy.

They were capable of long endurance both on the surface and submerged, their main features were the strength of the hull and the capability to operate almost silently and they were fitted with the very latest in sonar equipment.

The boats of this class were all named after fish or sea mammals.

8 Built

Cachalot
Walrus

Scotts, Greenock.
1955 - 1959
1958 - 1961
Finwhale
Grampus
Sealion

Cammell Laird, Birkenhead.
1956 - 1960
1955 - 1958
1958 - 1961
Narwhal
Porpoise
Rorqual

Vickers-Armstrong, Barrow-in-Furness.
1956 - 1959
1954 - 1958
1955 - 1958

 

Technical Information

Displacement:
2,030 sf 2,405 sm

Length (ft):
295.2 oa

Breadth (ft):
26.5

Draught/Height (ft):
na

Machinery:
2 x 1,650 h.p. Admiralty Standard Range diesels.
5,000 h.p. Electric Motors.

Speed (kts):
12 sf
17 sm

Oil Supply (tons):
na

Armament:
8 x 21 inch torpedo tubes, 6 bow, 2 stern.
30 reloads.

Range:
9,000 nm at 12 knots

Complement:
6 Officers and 65 Ratings.