R Class Submarine
R-class submarine may refer to: *British R-class submarine, a class of 12 small British diesel-electric submarines built for the Royal Navy during World War I *Italian R-class submarine, a group of submarines built for the Italian Royal Navy (Regia Marina Italiana) during World War II * ''Rainbow''-class submarine, a Royal Navy World War II submarine *United States R-class submarine The R-class submarines were a class of United States Navy submarines active from 1918 until 1945. With the first of the class laid down following the American entry into World War I, they were built rapidly. Although ''R-15'' through ''R-20'' we ...

British R-class Submarine
The R-class submarines were a class of 12 small British diesel-electric submarines built for the Royal Navy during World War I, and were forerunners of the modern attack submarine, in that they were designed specifically to attack and sink enemy submarines, their battery capacity and hull shape being optimized for underwater performance. With a submerged speed of 14 knots (26 km/h; 16 mph), the class set an underwater speed record not broken until the experimental Japanese Submarine No.71 of 1938, which was capable of more than 21 knots (39 km/h; 24 mph) submerged. Description Ordered in December 1917, the R class were designed to be faster underwater than on the surface, achieving a submerged speed of versus a surfaced speed of . They were well-streamlined, having no external ballast tanks, casing, or deck gun, and a streamlined spindle-shaped hull of circular cross-sectionFitzsimons, p.2170, "''R-1''" (not reproduced until the American USS ''Albacore'' ...
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Italian R-class Submarine
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 surfaced and submerged. The submarines were long, had a beam of and a draft of . They had a cargo capacity of . Chesneau, p. 307 For surface running, the boats were powered by two diesel engines, each driving one propeller shaft. When submerged each propeller was driven by a electric motor. They could reach on the surface and underwater. On the surface, the R class had a range of at ; submerged, they had a range of at .Bagnasco, p. 166 The boats were only armed for self-defense with three light anti-aircraft guns. Some boats may ...
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Rainbow-class Submarine
The ''Rainbow''-class submarine or R class was a quartet of patrol submarines built for the Royal Navy in the early 1930s. Design and description The ''Rainbow''-class submarines were designed as improved versions of the ''Parthian'' class and were intended for long-range operations in the Far East. The submarines had a length of overall, a beam of and a mean draft of . They displaced on the surface and submerged. The ''Rainbow''-class submarines had a crew of 56 officers and ratings. They had a diving depth of .Bagnasco, pp. 106–07 For surface running, the boats were powered by two diesel engines, each driving one propeller shaft. When submerged each propeller was driven by a electric motor. They could reach on the surface and underwater. On the surface, the boats had a range of at and at submerged. The boats were armed with six 21-inch torpedo tubes in the bow and two more in the stern. They carried six reload torpedoes for a grand total of fourteen torped ...
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