Grampus Class

Prototype Minelaying Submarine

  • Grampus Class Minelaying Submarine
  • Cachalot
  • Grampus
  • Narwhal
  • Rorqual
  • Seal
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Beneath the casing ran two rails which stretched the entire length of the casing, except in Porpoise. The mines were stowed on the rails until the time of laying the minefield. The casing had large stern doors which were opened when laying the mines and the mines were strewn through these stern doors.

Original intentions were to build more of this class but with the introduction of a special mine which could be accommodated and laid through the torpedo tubes these never materialised.

Though the new type of mine was developed with the intention of patrol submarines being able to lay minefields this was never the case during WWII and all mine laying was carried out by this class during the duration of WWII.

5 Built

Cachalot
Scotts, Greenock.
1937

Grampus
Seal

H.M. Dockyard, Chatham.
1936 - 1938

Narwhal
Porpoise
Rorqual

Vickers, Barrow-in-Furness.
1935 - 1937

 

 

 

Technical Information

Displacement:
1,520 sf
2,117 sm

Length (ft):
293 oa

Breadth (ft):
25.5 oa

Draught/Height (ft):
15.75

Machinery:
2 Admiralty x 1,650 bhp diesel engines.
2 Admiralty x 1,630 bhp electric motors.
Twin screws.

Speed (kts):
16 kts sf
8.75 kts sm

Oil Supply (tons):
150 tons
Armament:
6 x 21 inch bow tubes.
12 reloads.
1 x 4 inch gun.
2 x Machine guns.
50 mines.

Range:
5,800 nm at 9.3 kts sf.
64 nm at 4 kts

Complement:
59 officers and ratings.