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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 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
  

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

Fiat diesels / 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

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

Complement

50

Diving depth operational, m 120

Pietro Calvi as completed in 1961:

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)

Sensors 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