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fighting ships of the world

REGIA MARINA (ITALY)

SUBMARINES

B1 midget submarines (1916)

B1 1916

Names

B1-6

Builders

R. Arsenale La Spezia: B1-6

Completed

1916: B1-3

Losses

B4-6 (BU incomplete)

Transfers

None

Discarding

1/1919: B1-3

  

Displacement standard, t

 

Displacement normal, t

40 / 46

Length, m

15.1

Breadth, m

2.30

Draught, m

2.50

No of shafts

1

Machinery

Itala petrol engine / Savigliano electric motor

Power, h. p.

85 / 40 - 60

Max speed, kts

6.9 / 5

Fuel, t

petrol

Endurance, nm(kts) 128 (6.9) / 9(5)

Armament

2 - 450 TT (bow, 2)

Complement

5
Diving depth operational, m 50

Ship project history: An enlargement and an improvement of the 'A' class, these boats, also designed by Eng Vice Admiral Edgardo Ferrati, were provided with two different kind of motors, having a petrol motor for surface navigation and a greater endurance. Their torpedoes were in real tubes. They too had been conceived for harbour defence and were transportable by railway. B4-6 construction suspended in 1917, discarded 1919, scrapped 1920.

Modernizations: None.

Naval service: No significant events.

 

Ivan Gogin, 2014