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fighting ships of the world

ITALIAN NAVY (ITALY)

SUBMARINES

ENRICO TOTI attack submarines (1968 - 1969)

Enrico Toti 1975

Name No Builder Laid down Launched Comm Fate
Attilio Bagnolini S505 Italcantieri, Monfalcone 15/4/1965 26/8/1967 16/6/1968 discarded 7/1991
Enrico Toti S506 Italcantieri, Monfalcone 15/4/1965 12/3/1967 22/1/1968 discarded 9/1997
Enrico Dandolo S513 Italcantieri, Monfalcone 10/3/1967 16/12/1967 25/9/1968 discarded 9/1996
Lazzaro Mocenigo S514 Italcantieri, Monfalcone 12/6/1967 20/4/1968 11/1/1969 discarded 10/1993

 

Displacement standard, t

460

Displacement normal, t

535 / 591

Length, m

46.2

Breadth, m

4.70

Draught, m

4.00

No of shafts

1

Machinery

2 Fiat/Mercedes-Benz 820 N/1 diesel-generators, 1 electric motor

Power, h. p.

2200

Max speed, kts

9.7 / 14

Fuel, t

diesel oil

Endurance, nm (kts)

3000(5) /

Armament

4 - 533 TT (bow, 8)

Sensors

RM-20/SMG (BPS-704) radar, IPD-64 sonar, ECM suite, IPD-64 CCS

Complement

26

Diving depth operational, m

180

   

Ship project history: The small Totis were the first Italian-designed postwar submarines. Apparently the design began with a US-sponsored NATO project for a very small submarine, possibly inspired by US work on small ASW submarines about 1955 (the nuclear Tullibee was bought instead). The German Type 205/206 may also have come out of this programme. The first pair were included in the 1956 programme, and apparently the design changed considerably between then and 1964, when they were formally re-ordered. As described in 1958, they were rather larger: 800/1000t, with 2-shaft diesels-electric powerplants, 1400hp, 13.5/8kts, and four torpedo tubes. By 1960, the Italians had decided on single-shaft powerplant for higher underwater speed: 850t std, 1020t surfaced and 1230t submerged; 65.4x5.8x5.2m, 2 diesels, 1 electric motor, 2200hp, 13.5kts, with four torpedo tubes (eight torpedoes). At this time the wartime submarine Pietro Calvi was being rebuilt with a single screw for high underwater performance. Then the design was cut drastically (1964), to 380/480t, 48.77x4.65x4.65m, with the same 2200hp powerplant (for 9/13kts), and with only three torpedo tubes. Another account of this small design gives power as 1360bhp and motor power (single motor, single screw) as 850hp, for a speed of 10kts surfaced and 14kts submerged. The final design was slightly smaller but presumably with a fuller hull form, since it accommodated a 2200hp powerplant. Speed for one hour was 15kts.

    While these boats were being designed, the Italian Navy planned to buy one or more nuclear submarines for deep-ocean work. After that project was dropped, a longer-range diesel submarine (Sauro) was substituted. It would seem to follow that the cuts in size accompanied a decision to build a two-tier (inshore-deep water) force.

Modernizations: 1972, all: + MD-64 sonar

 

Naval service: No significant events.

Lazzaro Mocenigo 1978

 

Ivan Gogin, 2015