British Porpoise-class submarine

The Porpoise class was an eight-boat class of diesel-electric submarines operated by the Royal Navy. This class was originally designated patrol submarines, then attack. They were the first conventional British submarines to be built after the end of World War II. Their design was, in many ways, influenced by the German World War II-era Type XXI U-boats.

For the World War II minelaying submarines, see Grampus-class submarine.

Class overview
NamePorpoise
Builders
  • Vickers Shipbuilding and Engineering
  • Cammell Laird
  • Scotts Shipbuilding and Engineering Company
Operators Royal Navy
Preceded byExplorer class
Succeeded byOberon class
Built1956–1959
In service1961-1980s
In commission1956–1988
Completed8
General characteristics
TypePatrol/Attack submarine
Displacement
  • 2,080 tons surfaced
  • 2,450 tons submerged
Length290 ft (88 m)
Beam26 ft 7 in (8.10 m)
Draught18 ft (5.5 m)
Propulsion
  • 2 × Admiralty Standard range diesel generators, 1,650 hp (1,230 kW)
  • 2 × English Electric main motors, 6,000 hp (4,500 kW)
  • 2 shafts
Speed
  • 12 kn (22 km/h; 14 mph) surfaced
  • 17 kn (31 km/h; 20 mph) submerged
Range9,000 nmi (17,000 km; 10,000 mi) at 12 kn (22 km/h; 14 mph)
Complement71
Armament
  • 8 × 21 inch (533 mm) torpedo tubes, 6 bow, 2 stern
  • 30 × Mark 8 or Mark 23 torpedoes, later the Mark 24 Tigerfish
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