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REGIA MARINA / ITALIAN NAVY (ITALY)

SUBMARINES

FLUTTO II series medium submarines (1961)

nearly sister-ship Flutto 1943

Pietro Calvi 1963

Name No Yard No Builder Laid down Launched Comp Fate
Alluminio     OTO, Muggiano 12/1942 --- --- captured by Germany 9/9/1943
Antimonio     OTO, Muggiano 12/1942 --- --- captured by Germany 9/9/1943
Pietro Calvi (ex-Bario) S503   CRDA, Monfalcone // Tosi, Taranto 3/1943 23/1/1944 // 21/6/1959 16/12/1961 captured by Germany 9/9/1943 (UIT7), rebuilt 1957 - 1961, discarded 1/1972
Cromo     CRDA, Monfalcone 9/1943 --- --- captured by Germany 10/9/1943
Ferro     CRDA, Monfalcone 6/1943 --- --- captured by Germany 10/9/1943 (UIT12)
Fosforo     OTO, Muggiano 12/1942 --- --- captured by Germany 9/9/1943
Litio     CRDA, Monfalcone 3/1943 19/2/1944 --- captured by Germany 10/9/1943 (UIT8)
Manganese     OTO, Muggiano 12/1942 --- --- captured by Germany 9/9/1943
Piombo     CRDA, Monfalcone 8/1943 --- --- captured by Germany 10/9/1943 (UIT13)
Potassio     CRDA, Monfalcone 5/1943 --- --- captured by Germany 10/9/1943 (UIT10)
Rame     CRDA, Monfalcone 6/1943 --- --- captured by Germany 10/9/1943 (UIT11)
Silicio     OTO, Muggiano 12/1942 --- --- captured by Germany 9/9/1943
Sodio     CRDA, Monfalcone 5/1943 16/3/1944 --- captured by Germany 10/9/1943 (UIT9)
Zinco     CRDA, Monfalcone 8/1943 --- --- captured by Germany 10/9/1943 (UIT14)
Zolfo     OTO, Muggiano 12/1942 --- --- captured by Germany 9/9/1943
  
Data variant as designed

Displacement standard, t

766

Displacement normal, t

913 / 1113

Length, m

64.2

Breadth, m

6.98

Draught, m

4.93

No of shafts

2

Machinery

2 Fiat diesels / 2 CRDA electric motors

Power, h. p.

2400 / 800

Max speed, kts

16 / 8

Fuel, t

diesel oil 52 (norm.)

Endurance, nm(kts) 5400(8) / 80(4)

Armament

1 x 1 - 100/47 OTO 1938, 2 x 1 - 20/70 Scotti-Isotta Fraschini 1939, 6 - 533 TT (4 bow, 2 stern, 12)

Electronic equipment hydrophone

Complement

50

Diving depth operational, m 120

 

Data variant Pietro Calvi as completed

Displacement standard, t

800

Displacement normal, t

905 / 1107

Length, m

66.0

Breadth, m

6.98

Draught, m

4.00

No of shafts

1

Machinery

2 MAN diesels / 3 electric motors

Power, h. p.

2700 / 2700

Max speed, kts

14 / 14

Fuel, t

diesel oil

Endurance, nm(kts) 10000(8) /

Armament

4 - 533 TT (bow, 8)

Electronic equipment radar, sonar

Complement

60

Diving depth operational, m 120

Ship project history: Differed from the 1st series by only slightly increased hull length. 24 submarines were ordered, but till September, 1943 only 15 were laid down. 12 submarines of 3rd series were ordered in 1943, but no one submarine was laid down.

All 15 laid submarines 9/9/1943 have come into German hands. Seven boats being in a low degree of readiness (Alluminio, Antimonio, Fosforo, Manganese, Silicio, Zolfo and Cromo) were broken up on slipways. 8 ships of remaining has been decided to complete. Bario, Litio, Sodio, Potassio, Rame, Ferro, Piombo and Zinco were renamed UIT7-14 respectively. First three were launched, however all of them have been damaged during raid of Allied aircraft 16/3/1945 and 1/5/1945 scuttled by Germans. Remaining submarines this day were blown up on slipways. In 1945 Italians salvaged Bario and after restoring repair completed her as Pietro Calvi.

There were submarines that ordered but never laid down: Amianto, Magnesio, Mercurio (Tosi, Taranto), Cadmio, Iridio, Oro, Ottone, Rutenio, Vanadio (CRDA, Monfalcone). Other 12 submarines of III series were ordered: 6 from CRDA, 3 from Tosi and 3 from OTO. They possible names were Attinio, Azoto, Bromo, Carbonio, Elio, Molibdeno, Osmio, Ossigeno, Plutonio, Radio, Selenio and Tungsteno.

Modernizations: None.

Naval service: No significant events.

Pietro Calvi 1966

Ivan Gogin, 2009-15