|Name||No||Yard No||Builder||Laid down||Launched||Comp||Fate|
|Pier Capponi||Tosi, Taranto||8.1925||19.6.1927||1.1929||sunk 31.3.1941|
|Giovanni da Procida||Tosi, Taranto||9.1925||1.4.1928||1.1929||discarded 2.1948|
|Goffredo Mameli (ex-Masaniello)||Tosi, Taranto||8.1925||9.12.1926||1.1929||discarded 2.1948|
|Tito Speri||Tosi, Taranto||9.1925||25.5.1928||8.1929||discarded 2.1948|
|Displacement standard, t||786|
|Displacement normal, t||
810 / 993
|No of shafts||
2 Tosi diesels / 2 CGE electric motors
|Power, h. p.||
3000 / 1100
|Max speed, kts||
17.2 / 7.7
diesel oil 48
|Endurance, nm(kts)||3500(8) / 110(3)|
1 x 1 - 102/35 Schneider-Armstrong 1914-15, 2 x 1 - 13.2/76, 6 - 533 TT (4 bow, 2 stern, 10)
|Diving depth operational, m||100|
Design was developed by builder with usage of experience of former German submarines service, received by Italy after the First World War. Partially double-hulled. As a whole successful boats which have become the sample for subsequent submarines of the Italian fleet. Insufficient stability was unique appreciable defect of this class. For correction of it soon after the completion all four ships received external bulges. The speed was lowered from 17.2/7.7 to 15/7.5kts.
1930, all: bulges were fitted, max speed was 15 / 7.5 kts.
1942, all survived: diesels were replaced by new Tosi engines (4000bhp, 17kts surfaced)
Pier Capponi was sunk 31.3.1941 S of Stromboli by British submarine Rorqual.