H21 Class

Coastal Defence Submarine

  • H21 Class Submarine
  • H Class Submarines
  • H28 1918
  • H31
  • H49
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Due to the U.S. witholding the second batch of 'H' class the British decided to go ahead and build their own.   More or less the same design but somewhat longer and introducing the 21 inch torpedo tube in preference to the 18 inch.

21 Built

H21 - H32
Vickers, Barrow-in-Furness
1917 - 1919

H33, H34
Cammell Laird, Birkenhead
1917 - 1919

H43, H44
Armstrong Whitworth
Newcastle-on-Tyne
1917 - 1920

H47 - H50
Beardmore, Dalmuir
1917 - 1920

H52
HM Dockyard, Pembroke
1917 - 1919

Technical Information

Displacement:
440 sf
500 sm

Length (ft):
171

Breadth (ft):
15.75

Draught/Height (ft):
11.25

Machinery:
1 × 480 hp (358 kW) diesel engine
2 × 620 hp (462 kW) electric motors
2 screws

Speed (kts):
11.5 knots sf
9 knots sm

Oil Supply (tons):
16

Armament:
4 x 21 inch tubes (bow).
Reloads:6/8.

Range:
1,375 nm at 10 kts sf.
2,985 nm at 7.5 kts sf.
10 nm at 9 kts sm.
130 nm at 2 kts sm.

Complement:
22 Officers and Ratings.