United States R-class submarine

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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
NameR class
Builders
Operators
Preceded byO class
Succeeded byS class
Built1917-1919
In commission1918-1931, 1940-1945
Completed27
Lost2
Retired25
General characteristics
TypeSubmarine
Displacement
  • Group 1:
  • 569 long tons (578 t) surfaced
  • 680 long tons (691 t) submerged
  • Group 2:
  • 510 long tons (518 t) surfaced
  • 583 long tons (592 t) submerged
Length
  • Group 1: 186 ft 2 in (56.74 m)
  • Group 2: 175 ft (53 m)
Beam
  • Group 1: 18 ft 1 in (5.51 m)
  • Group 2: 16 ft 8 in (5.08 m)
Draft
  • Group 1: 14 ft 5 in (4.39 m)
  • Group 2: 13 ft 11 in (4.24 m)
Propulsion
Speed
  • Group 1:
  • 13.5 knots (25.0 km/h; 15.5 mph) surfaced
  • 10 knots (19 km/h; 12 mph) submerged
  • Group 2:
  • 14 knots (26 km/h; 16 mph) surfaced
  • 11 knots (20 km/h; 13 mph) submerged
Test depth200 ft (61 m)
Complement30 officers and men
Armament

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 were completed July–October 1918, they did not serve overseas, and the bulk of the class were not completed until after the Armistice.

Design[edit]

Group 1
The R-1 through R-20 boats, designed by Electric Boat and built by Fore River Shipyard and Union Iron Works, were known as the R-1-class submarines. These single-hull boats were structurally very similar to the preceding O class, but larger and therefore with more powerful machinery to maintain the required speed. For the first time in a US submarine class, 21 inch (533 mm) torpedo tubes were fitted, a tube diameter that is still standard worldwide. A more powerful fixed 3-inch (76 mm)/50 caliber deck gun replaced the retractable 3-inch/23 caliber gun found on previous classes.[1]
Group 2
R-21 to R-27, which were slightly smaller and faster than the R-1s, were designed and built by Lake Torpedo Boat Co. and are sometimes regarded as a separate class, the R-21 class. Compared with the Lake-designed O-class group, these featured a double hull and had their diving planes more conventionally positioned fore and aft, but retained the Lake O-class' characteristic wide stern and 18 inch (450 mm) torpedo tubes. They were equipped with the same 3-inch/50 deck gun as the Group 1 boats. Their smaller size compared with Group 1 allowed Lake to repeat the machinery of their O-class boats, which probably resulted in cost savings. Some Group 2 boats were fitted with a bow fairing to improve reserve buoyancy. This probably housed expanded ballast tanks. Unlike the Group 1 boats, most of which survived to serve in World War II, the Group 2 boats were scrapped in 1930 as part of the Navy's compliance with the London Naval Treaty. The Lake company's demise in 1924 and the obsolescent 18-inch torpedo armament probably also contributed to this.[2][3]

Service[edit]

The Group 1 boats, after crossing the Panama Canal as a group of 20 on January 18, 1931 were decommissioned in 1931, but were recommissioned in 1940, patrolling in the Caribbean or being used as sonar targets at Key West, Florida, also patrolling between Submarine Base New London, Connecticut and Bermuda. At least two R-boats unsuccessfully fired torpedoes at German U-boats on the Bermuda patrols. Three (R-3, R-17, and R-19) were transferred to the United Kingdom's Royal Navy as HMS P.511, HMS P.512, and HMS P.514 in 1941-1942. P.514 was lost on 21 June 1942 in a collision with the Canadian minesweeper HMCS Georgian due to being mistaken for a U-boat. R-12 was lost on 12 June 1943 in an accident off Key West.

At some point between the wars the US R class were modified for improved rescue ability in the event of sinking. A motor room hatch was added, the motor room being the aftermost compartment. The tapered after casing became a step as a result of this modification.[4]

At least one R-class submarine can be seen briefly in the 1943 movie Crash Dive, filmed at the New London submarine base.

Electric Boat built four R-class 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.

In December 2020, the remains of R-8 were discovered off the coast of Ocean City, Maryland.[5] The vessel sank there in 1936, after being used for target practice by bombers.

Ships in class[edit]

The 27 submarines of the R class were:

Construction data for Group 1 (Electric Boat design)
Ship name and hull no. Builder Laid down Launched Commissioned Decommissioned Fate
USS R-1 (SS-78) Fore River Shipbuilding 16 October 1917 24 August 1918 16 December 1918 20 September 1945 Scrapped 1946
USS R-2 (SS-79) 16 October 1917 23 September 1918 24 January 1919 10 May 1945 Scrapped 1946
USS R-3 (SS-80) 11 December 1917 18 January 1919 17 April 1919 transferred to United Kingdom 4 November 1941 Scrapped 1948
USS R-4 (SS-81) 16 October 1917 26 October 1918 28 March 1919 18 June 1945 Scrapped 1946
USS R-5 (SS-82) 16 October 1917 24 November 1918 15 April 1919 14 September 1945 Scrapped 1946
USS R-6 (SS-83) 17 December 1917 1 March 1919 1 May 1919 27 September 1945 Scrapped 1946
USS R-7 (SS-84) 6 December 1917 5 April 1919 1 May 1919 14 September 1945 Scrapped 1946
USS R-8 (SS-85) 4 March 1918 17 April 1919 21 July 1919 2 May 1931, sank at moorings 1936 Raised and expended as target 1936; remains discovered 2020
USS R-9 (SS-86) 6 March 1918 24 May 1919 30 July 1919 25 September 1945 Scrapped 1946
USS R-10 (SS-87) 21 March 1918 28 June 1919 20 August 1919 18 June 1945 Scrapped 1946
USS R-11 (SS-88) 18 March 1918 21 July 1919 5 September 1919 5 September 1945 Scrapped 1946
USS R-12 (SS-89) 28 March 1918 15 August 1919 23 September 1919 N/A Sank during training exercise 12 June 1943; wreck found 2011
USS R-13 (SS-90) 27 March 1918 27 August 1919 17 October 1919 14 September 1945 Scrapped 1946
USS R-14 (SS-91) 6 November 1918 10 October 1919 24 December 1919 7 May 1945 Scrapped 1946
USS R-15 (SS-92) Union Iron Works 30 April 1917 10 December 1917 27 July 1918 17 September 1945 Scrapped 1946
USS R-16 (SS-93) 26 April 1917 15 December 1917 5 August 1918 16 July 1945 Scrapped 1946
USS R-17 (SS-94) 5 May 1917 24 December 1917 18 August 1918 transferred to United Kingdom 9 March 1942 Scrapped 1945
USS R-18 (SS-95) 16 June 1917 8 January 1918 11 September 1918 19 September 1945 Scrapped 1946
USS R-19 (SS-96) 23 June 1917 28 January 1918 7 October 1918 transferred to United Kingdom 9 March 1942 Rammed and sunk by HMCS Georgian 21 June 1942
USS R-20 (SS-97) 4 June 1917 21 January 1918 26 October 1918 27 September 1945 Scrapped 1946
Construction data for Group 2 (Lake Torpedo Boat Company design)
Ship name and hull no. Builder Laid down Launched Commissioned Decommissioned Fate
USS R-21 (SS-98) Lake Torpedo Boat Co. 19 April 1917 10 July 1918 17 June 1919 21 June 1924 Scrapped 1930
USS R-22 (SS-99) 19 April 1917 23 September 1918 1 August 1919 29 April 1925 Scrapped 1930
USS R-23 (SS-100) 25 April 1917 5 November 1918 23 October 1919 25 April 1925 Scrapped 1930
USS R-24 (SS-101) 9 May 1917 21 August 1918 27 June 1919 11 June 1925 Scrapped 1930
USS R-25 (SS-102) 26 April 1917 15 May 1919 23 October 1919 21 June 1924 Scrapped 1930
USS R-26 (SS-103) 26 April 1917 18 June 1919 23 October 1919 12 June 1925 Scrapped 1930
USS R-27 (SS-104) 16 May 1917 23 September 1918 3 September 1919 24 April 1925 Scrapped 1930

References[edit]

Notes[edit]

  1. ^ Gardiner, p. 130
  2. ^ Gardiner, p. 130
  3. ^ Pigboats.com R-boats page
  4. ^ Pigboats.com R-boats page
  5. ^ "American submarine discovered off Ocean City coast". Baltimore Sun. December 10, 2020. Retrieved December 12, 2020.

Sources[edit]

External links[edit]

Media related to R class submarines of the United States at Wikimedia Commons