Of the Tritone-class or Flutto-class type II. Dimensions 64.19 x 6.98 x 4.93 metres a displacement of 928 (surfaced)-1.131 (submerged) tons. Crew numbered 49 men including 5 officers. Speed 16 (surfaced)-8 (submerged) knots. Range surfaced 5.400 nautical miles/8 knots respectively 2.000/16 and submerged 80 nautical miles/4 knots respectively 7/8. Armament 7-53,3cm/21” torpedo tubes (4 for, 2 aft), 1-10cm/4” cal 47 gun on the fore deck before the tower and 2x1-2cm anti aircraft guns. Diving depth 130 metres. After 1961 displacement 800 (standard)-905 (surfaced)-1.107 (submerged) tons and as dimensions 66.0 x 7.0 x 4.0 metres or 216.5 x 23 x 13.2 feet. Crew numbered 60 men. Range 10.000 nautical miles/8 knots. Speed 14 (surfaced)-14 (submerged) knots. Armament 5-53.3cm/21” torpedo tubes. Built by CRDA, Monfalcone, Italy. Laid down 20 March 1943, captured by the Germans after the Italian armistice of 3 September 1943, launched 23 January 1944, renamed UIT-7, scuttled in May 1945, in Italian hands in 1945, rebuilt with a tear drop bow and modernized between 1957-1959, launched on 21 June 1959, renamed Pietro Calvi (S503) in March 1961, commissioned on 16 December 1961 and stricken between 1971 and 973.
Sources
Erminio Bagnasco, Submarines of World War Two, Cassell & Co, London. 1977
Paolo M. Pollina. I Sommergibili Italiani. Ufficio Storico della Marina Militare. Rome, 1963
Several editions of Jane’s Fighting Ships
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