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REGIA MARINA / ITALIAN NAVY (ITALY)

SUBMARINES

"CB" midget submarines (1941-1943)

CB1 1941

Names

CB1 - 22

Builders

Caproni, Milano: CB1-22

Completed

1 - 5/1941: CB1 - 6

8/1943: CB7 - 12

Losses

captured incomplete by Germany: CB13 (11/9/1943, completed for RSI 9/1943, sunk 23/3/1945), CB14 (11/9/1943, completed for RSI late 1943, sunk 1944/45), CB15 (11/9/1943, completed for RSI late 1943, sunk 1944/45), CB16 (11/9/1943, completed for RSI 9/1943, grounded 1/10/1944), CB17 (10/9/1943, completed for RSI as CB6 late 1943, sunk 3/4/1945), CB18 (10/9/1943, completed for RSI 9/1943, sunk 31/3/1945), CB19 (10/9/1943, completed for RSI late 1943, BU 1947), CB20 (10/9/1943, completed for RSI late 1943, captured by Yugoslavia 4/1945), CB21 (9/1943, completed for RSI late 1943, sunk 29/4/1945), CB22 (9/1943)

CB5 (13/6/1942), CB7 (captured by Germany 12/9/1943)

Transfers

Romania, 9/1943: CB1 - 4, CB6 (CB1 - 4, CB6)

Discarding

1948: CB8 - 12

  

Displacement standard, t

25

Displacement normal, t

35 / 44

Length, m

15.0

Breadth, m

3.00

Draught, m

2.05

No of shafts

1

Machinery

Isotta-Fraschini diesel / BBC electric motor

Power, h. p.

80 / 50

Max speed, kts

7.5 / 7

Fuel, t

diesel oil

Endurance, nm(kts) 1400(5) / 50(3)

Armament

2 - 450 TT (ext cradles, 2) or 2 mines

Complement

4

Diving depth operational, m 55

Ship project history: Increased variant of 1st series CA (before reconstruction), intended for protection of coast and harbours. 22 boats were laid down till September 1943, only 12 of them (CB1-12) were completed. Remaining 10 incomplete boats were  captured by Germans. 50 more CB boats of so-called 2nd series have been ordered to Caproni, but only 3 from them were launched (CB23-25) and remained incomplete.

Modernizations: None.

Naval service:  Five boats (CB1-4 and 6), in September, 1943 were captured by German troops and soon transferred to Romania. In January, 1944 they again were returned to Italians, this time to puppet "Social Republic". They all were scuttled at Constance 25/8/1944. Besides 5 boats on Black sea, in September, 1943 Germans captured damaged CB7, remained never repaired and used for completion of CB13. Latter, as well as 9 more boats captured at the time of outfitting, have got under the control of 10th MAS flotilla of "Social Republic".

CB12 1947

 

Ivan Gogin, 2009-14