Perla-class submarine

	Perla-class submarine (Perla)
Class overview
Name	Perla class
Builders	OTO, Muggiano; CRDA, Monfalcone;
Operators	Regia Marina
Preceded by	Sirena class
Succeeded by	Adua class
Built	1935–36
In commission	1936–1947
Completed	10
Lost	6
Scrapped	4
General characteristics
Type	Submarine
Displacement	695 tonnes (684 long tons) surfaced; 855 tonnes (841 long tons) submerged;
Length	197 ft 6 in (60.20 m)
Beam	21 ft (6.4 m)
Draft	15 ft 5 in (4.70 m)
Installed power	1,400 hp (1,000 kW) (diesels); 800 hp (600 kW) (electric motors);
Propulsion	Diesel-electric; 2 × diesel engines; 2 × electric motors;
Speed	14 knots (26 km/h; 16 mph) surfaced; 7.5 knots (13.9 km/h; 8.6 mph) submerged;
Range	5,200 nmi (9,600 km; 6,000 mi) at 8 knots (15 km/h; 9.2 mph) surfaced; 74 nmi (137 km; 85 mi) at 4 knots (7.4 km/h; 4.6 mph) submerged;
Test depth	80 m (260 ft)
Complement	45
Armament	6 × 533 mm (21 in) torpedo tubes (4 bow, 2 stern); 1 × 100 mm (4 in) / 47 caliber deck gun; 1 or 2 × twin 13.2 mm (0.52 in) anti-aircraft guns;

The Perla-class submarines were the third sub-class of the 600 Series of coastal submarines built for the Royal Italian Navy (Regia Marina) during the 1930s and named after gemstones. Of the ten boats built of this class, only three survived World War II.

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