Adua-class submarine
Adua
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| Class overview | |
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| Name: | Adua class |
| Builders: |
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| Operators: |
 Regia Marina, Brazilian Navy
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| Preceded by: | Perla class |
| Succeeded by: | Acciaio class |
| In commission: | 1937–1948 |
| Completed: | 17 |
| Lost: | 16 |
| General characteristics | |
| Type: | Submarine |
| Displacement: |
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| Length: | 60.18 m (197 ft 5 in) |
| Beam: | 6.45 m (21 ft 2 in) |
| Draft: | 4.7 m (15 ft 5 in) |
| Installed power: |
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| Propulsion: | |
| Speed: |
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| Range: |
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| Test depth: | 80 m (260 ft) |
| Complement: | 45 |
| Armament: |
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The Adua-class submarine was the fourth sub-class of the 600 Series of coastal submarines built for the Royal Italian Navy (Regia Marina) during the 1930s. There were 17 submarines in this class, almost all named after places in Ethiopia which had been an Italian colony since 1936, but only one, Alagi, survived World War II. Three submarines of this class (Gondar, Ascianghi, and Neghelli) were sold to Brazil before the war and replaced with submarines of the same names.
The Adua-class submarines were essentially repeats of the preceding Perla class design. They displaced 680 metric tons (670 long tons) surfaced and 844 metric tons (831 long tons) submerged. The submarines were 60.18 meters (197 ft 5 in) long, had a beam of 6.45 meters (21 ft 2 in) and a draft of 4.7 meters (15 ft 5 in).
For surface running, the boats were powered by two 600-brake-horsepower (447 kW) diesel engines, each driving one propeller shaft. When submerged each propeller was driven by a 400-horsepower (298 kW) electric motor. They could reach 14 knots (26 km/h; 16 mph) on the surface and 7.5 knots (13.9 km/h; 8.6 mph) underwater. On the surface, the Adua class had a range of 3,180 nautical miles (5,890 km; 3,660 mi) at 10.5 knots (19.4 km/h; 12.1 mph), submerged, they had a range of 74 nmi (137 km; 85 mi) at 4 knots (7.4 km/h; 4.6 mph).
The boats were armed with six internal 53.3 cm (21.0 in) torpedo tubes, four in the bow and two in the stern. One reload torpedo was carried for each tube, for a total of twelve. They were also armed with one 100 mm (3.9 in) deck gun for combat on the surface. The light anti-aircraft armament consisted of one or two pairs of 13.2 millimeters (0.52 in) machine guns.
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Wikipedia