S Class

Group Three 1942 Programme

Medium Patrol Submarine

  • S Class Submarine
  • Seascout
  • Selene
  • Seneschal
  • Sentinel
  • Sidon 1950
  • Sleuth 1953
  • Solent 1953
  • Spearhead
  • Sturdy
  • Stygian
  • Subtle
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In the late 1920's and early 1930's it was decided that two main type of patrol submarine would meet the future requirements of the Long Range Overseas Patrol Submarine, a medium sized type for confined waters and a slightly larger one for overseas.

Having learned from past experience that external fuel tanks were not ideally suited the decision was taken that all future construction of submarines should have their fuel tanks internally built.   It was intended to maintain the quick diving and the manageable handling of the 'H' class whilst submerged, combined with the long range qualities of the 'O','P' and 'R' classes.

The result was the 'S' class. This class was in production for over 15 years and was the largest single group of submarines built for the Royal Navy.

There were three distinct groups in this class with varying differences as will be seen within the class notes and individual boat profiles.

12 Built

Seascout
Selene
Sidon
Sleuth
Solent
Spearhead
Sturdy
Stygian
Subtle
Supreme

Cammell Laird, Birkenhead.
1940 - 1945
Seneschal
Sentinel

Scotts, Greenock.
1941 - 1945

 












Technical Information

Displacement:
715 sf
990 sm
(Except Sturdy and Stygian - 865sf / 890sm)

Length (ft):
217 oa

Breadth (ft):
23.75

Draught/Height (ft):
13.25

Machinery:
8 cylinder Admiralty diesel engines 1,900 bhp
Admiralty electric motors 1,300 bhp

Speed (kts):
14.75 sf
9 sm

Oil Supply (tons):
44 normal (84 max)
Except Sturdy and Stygian 67 normal 92 max

Armament:
1 x 4 inch/40 QF
1 x 20mm Oerlikon
2 or 3 0.303 Leiw or Vickers MG
6 x 21 inch bow tubes, 12 reloads or 12 mines.
Except Sturdy, Stygian and Subtle:
7 x21 inch (6 bow tubes 1 stern tube)
13 reloads or 12 mines
1 x 3 inch/45QF
1 x 20mm Oerlikon
2 or 3 0.303 MG.

Range:
7,500 nm at 10 kts (Surface on 84 ton Diesel oil)

Complement:
48