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United States R-class submarine
R-class submarines
Tied up along the dock from right to left: R-12 (SS-89), R-15 (SS-92), R-13 (SS-90) with R-9 (SS-86) and an unidentified R-boat probably in Pearl Harbor, c. mid 1920s.
Class overview
Builders: Fore River Shipyard (R-1 to R-14)
Union Iron Works (R-15 to R-20)
Lake Torpedo Boat (R-21 to R-27)
Electric Boat (4 boats for Peru)
Operators:  United States Navy
 Peruvian Navy
 Royal Navy
Preceded by: O-class submarine
Succeeded by: S-class submarine
In commission: 1918–1945
Completed: 27
Lost: 1
Retired: 26
General characteristics
Type: Submarine
Displacement: 569 long tons (578 t) surfaced
680 long tons (691 t) submerged
Length: 186 ft 2 in (56.74 m)
Beam: 18 ft (5.5 m)
Draft: 14 ft 6 in (4.42 m)
Propulsion: Diesel-electric
Speed: 13.5 knots (25.0 km/h; 15.5 mph) surfaced
10.5 knots (19.4 km/h; 12.1 mph) submerged
Complement: 30 officers and men
Armament: • 4 × 21 in (533 mm) torpedo tubes
• 1 × 3"/50 caliber deck gun

The R-class submarines were a class of United States Navy submarines active from 1918 until 1945.

The R-1 thru R-20 boats built by Fore River Shipyard and Union Iron Works were known as the "R-1 class" subs. These single-hull submarines were structurally very similar to the preceding O-class, but with the addition of 21-inch torpedo tubes and a fixed (rather than retractable) gun mount.

Boats R-21 to R-27, which were slightly smaller and faster than the R-1s, were built by Lake Torpedo Boat and are sometimes regarded as a separate class, the "R-21 class." These featured a double-hull and had their diving planes more conventionally positioned fore and aft, but retained the characteristic wide stern and 18-inch torpedo tubes.

Electric Boat built four boats for the Peruvian Navy (R-1 to R-4). Built after World War I using materials assembled from cancelled S-class submarines, they were refitted in 1935–36 and 1955–56, and renamed Islay, Casma, Pacocha, and Arica in 1957. They were discarded in 1960.

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