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Porpoise Class, British Submarines


Photograph of HMS Rorqual, a Porpoise-class submarine

Imperial War Museum A 16327. Via Wikimedia Commons


Specifications:


Tonnage

1810 tons surfaced
2157 tons submerged

Dimensions

288'0" by 29'10" by 13'9"
89.1m by 7.7m by 5.1m

Maximum speed      

15.75 knots surfaced
8.75 knots submerged

Dive to 220 feet
to 66 meters

Complement

59

Armament

6 21" torpedo tubes (12 torpedoes)
50 Mark XVI mines
1 4"/40 gun
2 0.303 Lewis machine guns
Machinery
2-shaft diesel (3300 hp) or electric (1630 hp)
Bunkerage 150 tons diesel oil

Range

5880 nautical miles (10,890 km) at 9.3 knots surfaced
64 nautical miles (119 km) at 4 knots submerged

The Porpoises were minelaying submarines built in 1931-1937. They used a simple and effective minelaying systems in which mines were stored in a rail on top of the pressure hull and winched through a hatch in the stern. However, the final three units were canceled when a mine suitable for deployment through the torpedo tubes of regular submarines was developed.


Units in the Pacific:

Rorqual    
Arrived 1944     

Porpoise     
Arrived 1944 Sunk by aircraft in 1945-1-19 in Malacca Strait

References

Bagnasco (1977)

Uboat.net (accessed 2010-1-16)



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