B Class

Coastal Submarine

  • B Class Submarine
  • B1
  • B2
  • B4
  • B11
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The 'B' Class were an improvement on the 'A' Class and the Holland both in terms of endurance and conditions for the rather larger crew of two officers and thirteen ratings and almost doubling the displacement of the 'A' Class.

There were still no dividing bulkheads, accommodation space nor ventilation of  the living area.   A deck casing was fitted to this class in the hope  of improving movement about the boat when surfaced.This Class was also the first British submarine to be built with a second  pair of hydroplanes in addition to those fitted astern.   These were initially fitted on the forward side of the conning tower, but later on were transferred further forward to the bows.   This had been experimented  with on A7 and would subsequently be fitted in all British submarines.   Still rather limited in endurance and meant for defensive  purposes. The two 18 inch torpedo tubes in this class were angled downwards in the belief that torpedoes would be discharged while the submarine rose to the surface.   Two reload torpedoes were carried.

This Class were still powered by a 16 cylinder petrol engine.

11 Built


B1 - B11
Vickers, Barrow-in-Furness
1904 - 1906


Technical Information

287 sf
316 sm

Length (ft):

Breadth (ft):

Draught/Height (ft):

600 hp petrol engine.
225 hp electric  motor.

Speed (kts):
12.0 sf
6.5 sm

Fuel Supply (tons):
Oil Supply (tons):
15.5 (Petrol)

2 x 18 inch tube (bow)
Reloads: 2

1,110nm at 12 kts sf.
1,000nm at 8.7 kts sm.

2 officers and 13  ratings.