Italian Squalo-class submarine (Squalo)
|Preceded by:||Bandiera class|
|Succeeded by:||Glauco class|
|Length:||69.8 m (229 ft 0 in)|
|Beam:||7.21 m (23 ft 8 in)|
|Draft:||5.19 m (17 ft 0 in)|
|Test depth:||80 m (260 ft)|
The Squalo-class submarines were a group of four submarines built for the Royal Italian Navy (Regia Marina) during the 1930s. They were built at the Cantieri Riuniti dell'Adriatico (CRDA) shipyard at Monfalcone, and designed by Curio Bernardis.
Design and description
The Squalo-class submarines were essentially repeats of the preceding Bandiera class. They shared that design's problems with stability and seakeeping and required the same modifications to rectify the problems. They displaced 920 metric tons (910 long tons) surfaced and 1,125 metric tons (1,107 long tons) submerged. The submarines were 69.8 meters (229 ft 0 in) long, had a beam of 7.21 meters (23 ft 8 in) and a draft of 5.19 meters (17 ft 0 in).
For surface running, the boats were powered by two 1,500-brake-horsepower (1,119 kW) diesel engines, each driving one propeller shaft. When submerged each propeller was driven by a 650-horsepower (485 kW) electric motor. They could reach 15.1 knots (28.0 km/h; 17.4 mph) on the surface and 8 knots (15 km/h; 9.2 mph) underwater. On the surface, the Squalo class had a range of 5,650 nautical miles (10,460 km; 6,500 mi) at 8 knots (15 km/h; 9.2 mph), submerged, they had a range of 100 nmi (190 km; 120 mi) at 3 knots (5.6 km/h; 3.5 mph).
The boats were armed with eight internal 53.3 cm (21.0 in) torpedo tubes, four each in the bow and stern. They carried a total of a dozen torpedoes. They were also armed with one 102 mm (4.0 in)/35 deck gun for combat on the surface. The light anti-aircraft armament consisted of one or two 13.2 mm (0.52 in) machine guns.
- Delfino (English: Dolphin), sank after a collision off Taranto, 23 March 1943.
- Narvalo (English: Narwhal), sunk by the British destroyers Pakenham and Hursley, and RAF aircraft, in the Mediterranean Sea at , 14 January 1943.
- Squalo (English: Shark), withdrawn from service, 9 September 1943.
- Tricheco (English: Walrus), sunk by the British submarine Upholder off Brindisi in the Adriatic Sea at , 18 March 1942.
- Bagnasco, Erminio (1977). Submarines of World War Two. Annapolis, Maryland: Naval Institute Press. ISBN 0-87021-962-6.
- Chesneau, Roger, ed. (1980). Conway's All the World's Fighting Ships 1922–1946. Greenwich, UK: Conway Maritime Press. ISBN 0-85177-146-7.
- Rohwer, Jürgen (2005). Chronology of the War at Sea 1939-1945: The Naval History of World War Two (Third Revised ed.). Annapolis, Maryland: Naval Institute Press. ISBN 1-59114-119-2.