Italian R-class submarine
group of submarines built for the Italian Royal Navy (Regia Marina Italiana) during World War II
The R-class or Romolo-class submarine was a group of submarines built for the Royal Italian Navy (Regia Marina Italiana) during World War II. They were designed as blockade running transport submarines for transporting high-value cargo from Europe to Japan and vice versa. Axis-occupied Europe lacked strategic materials such as tungsten, tin and some commodities such as rubber.
Design and description
The R-class submarines displaced 2,155 metric tons (2,121 long tons) surfaced and 2,560 metric tons (2,520 long tons) submerged. The submarines were 86.5 meters (283 ft 10 in) long, had a beam of 7.86 meters (25 ft 9 in) and a draft of 5.34 meters (17 ft 6 in). They had a cargo capacity of 600 tonnes (591 long tons).
For surface running, the boats were powered by two 1,300-brake-horsepower (969 kW) diesel engines, each driving one propeller shaft. When submerged each propeller was driven by a 450-horsepower (336 kW) electric motor. They could reach 13 knots (24 km/h; 15 mph) on the surface and 6 knots (11 km/h; 6.9 mph) underwater. On the surface, the R class had a range of 12,000 nautical miles (22,000 km; 14,000 mi) at 9 knots (17 km/h; 10 mph); submerged, they had a range of 110 nmi (200 km; 130 mi) at 3.5 knots (6.5 km/h; 4.0 mph).
The boats were only armed for self-defense with three 20-millimeter (0.79 in) light anti-aircraft guns.
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