Marconi-class submarine

	Leonardo Da Vinci, the most successful Italian submarine in World War II
Class overview
Operators	Regia Marina; Kriegsmarine; Imperial Japanese Navy;
In commission	1940–1945
Completed	6
Lost	5
General characteristics
Type	Submarine
Displacement	1,195 long tons (1,214 t) (surfaced); 1,490 long tons (1,514 t) (submerged);
Length	76.5 m (251 ft 0 in)
Beam	6.81 m (22 ft 4 in)
Draught	4.72 m (15 ft 6 in)
Propulsion	Diesel-electric; 2 × CRDA diesel engines; 2 × Marelli electric motors;
Speed	17.8 kn (33.0 km/h; 20.5 mph) (surfaced); 8.2 kn (15.2 km/h; 9.4 mph) (submerged);
Range	Surfaced: 2,900 nmi (5,400 km; 3,300 mi) at 17 kn (31 km/h; 20 mph); 10,500 nmi (19,400 km; 12,100 mi) at 8 kn (15 km/h; 9.2 mph); Submerged: 8 nmi (15 km; 9.2 mi) at 8 kn (15 km/h; 9.2 mph); 110 nmi (200 km; 130 mi) at 3 kn (5.6 km/h; 3.5 mph);
Test depth	90 m (300 ft)+
Complement	57
Armament	8 × 533 mm (21.0 in) torpedo tubes; (4 bow, 4 stern); 1 × 100 mm (4 in) / 47 caliber gun; 4 × 13.2 mm (0.52 in) machine guns;

The Marconi class was a class of six submarines built for the Royal Italian Navy (Italian: Regia Marina). The submarines were all launched between 1939 and 1940, and all but one, Luigi Torelli, were lost in the Atlantic during the Second World War.

Class overview
Leonardo Da Vinci, the most successful Italian submarine in World War II
Operators	Regia Marina Kriegsmarine Imperial Japanese Navy
In commission	1940–1945
Completed	6
Lost	5
General characteristics
Type	Submarine
Displacement	1,195 long tons (1,214 t) (surfaced) 1,490 long tons (1,514 t) (submerged)
Length	76.5 m (251 ft 0 in)
Beam	6.81 m (22 ft 4 in)
Draught	4.72 m (15 ft 6 in)
Propulsion	Diesel-electric; 2 × CRDA diesel engines 2 × Marelli electric motors
Speed	17.8 kn (33.0 km/h; 20.5 mph) (surfaced) 8.2 kn (15.2 km/h; 9.4 mph) (submerged)
Range	Surfaced: 2,900 nmi (5,400 km; 3,300 mi) at 17 kn (31 km/h; 20 mph); 10,500 nmi (19,400 km; 12,100 mi) at 8 kn (15 km/h; 9.2 mph) Submerged: 8 nmi (15 km; 9.2 mi) at 8 kn (15 km/h; 9.2 mph); 110 nmi (200 km; 130 mi) at 3 kn (5.6 km/h; 3.5 mph)
Test depth	90 m (300 ft)+
Complement	57
Armament	8 × 533 mm (21.0 in) torpedo tubes (4 bow, 4 stern) 1 × 100 mm (4 in) / 47 caliber gun 4 × 13.2 mm (0.52 in) machine guns