United States R-class submarine

For other ship classes of the same name, see British R-class submarine and Italian R-class submarine.

The R-class submarines were a class of United States Navy coastal-defense 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. As had been the usual practice in several of the preceding classes, design and construction of the 27 boats of this class was split between the Electric Boat Company and the Lake Torpedo Boat Company. Both designs were built to the same military operational specifications, but differed considerably in design and detail specifics.^[4]

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
Name	R class
Builders	Bethlehem Quincy (R-1 to R-14)[1] Bethlehem San Francisco (R-15 to R-20)[2] Lake Torpedo Boat Co. (R-21 to R-27) Electric Boat Co. (Four boats for Peru)
Operators	United States Navy  Peruvian Navy  Royal Navy
Preceded by	O class
Succeeded by	S class
Built	1917–1919
In commission	1918–1931, 1940–1945
Completed	27
Lost	2
Retired	25
General characteristics
Type	Submarine
Displacement	Electric Boat design: 574 long tons (583 t) surfaced 685 long tons (696 t) submerged Lake Torpedo Boat Co. design: 497 long tons (505 t) surfaced 652 long tons (662 t) submerged
Length	Electric Boat design: 186 ft 3 in (56.77 m) Lake Torpedo Boat Co. design: 175 ft (53 m)
Beam	Electric Boat design: 18 ft 0 in (5.49 m) Lake Torpedo Boat Co. design: 16 ft 7 in (5.05 m)
Draft	Electric Boat design: 14 ft 5 in (4.39 m) Lake Torpedo Boat Co. design: 13 ft 11 in (4.24 m)
Propulsion	Electric Boat design: 2 × 600 hp (447 kW) NELSECO 6-EB-14 diesel engines 2 × 467 hp (348 kW) Electro Dynamic Co. electric motors 2 × 60-cell batteries 2 × shafts Lake Torpedo Boat Co. design: 2 × 500 hp (373 kW) Busch-Sulzer diesel engines 2 × 400 hp (298 kW) Diehl electric motors 1 × 120-cell batteries 2 × shafts
Speed	Electric Boat design: 12.5 knots (23.2 km/h; 14.4 mph) surfaced 9.3 knots (17.2 km/h; 10.7 mph) submerged Lake Torpedo Boat Co. design: 14 knots (26 km/h; 16 mph) surfaced 11.4 knots (21.1 km/h; 13.1 mph) submerged
Test depth	200 ft (61 m)
Complement	30 officers and men
Armament	Both designs: 4 × 21-inch (533 mm) torpedo tubes, 8 torpedoes 1 × 3 inch (76 mm)/50 caliber deck gun[3]

Design

Electric Boat

The R-1 through R-20 boats were designed by Electric Boat and built by the company's subcontractor yards Bethlehem Quincy and Bethlehem San Francisco. These single-hull boats were structurally similar to the preceding O class, but larger and therefore with more powerful machinery to maintain the required speed. Electric Boat departed from their traditional rotating bow cap that acted as the muzzle doors for the torpedo tubes. All submarines from the R-class forward built by this company would have individual muzzle doors.^[5] For the first time in a U.S. submarine class, 21-inch (533 mm) torpedo tubes were fitted, a tube diameter that is still standard worldwide. A more powerful non-retractable 3-inch (76 mm)/50-caliber deck gun replaced the retractable 3-inch/23-caliber gun found on previous classes.^[6]

Lake

R-21 to R-27, which were slightly smaller and faster than the Electric Boat design, were designed and built by Lake Torpedo Boat Co. Simon Lake finally gave up on his patented zero-angle (aka "even-keel") diving method with midships-mounted diving planes, and adopted the Electric Boat style angled diving method using bow and stern mounted diving planes. The Lake-style flat shovel stern with ventrally mounted rudder, diving planes, and propellers were retained for this class.^[7] There is conflicting information as to what size torpedo tubes were mounted in the Lake boats, with authoritative references by Gardiner and Friedman^[8] disagreeing as to whether they were equipped with 18-inch (450 mm) torpedo tubes or the 21-inch tubes of the Electric Boat design. They were equipped with the same 3-inch/50-caliber deck gun as the Electric Boat design. At least one boat, R-22,^[9] was fitted with an expanded bow buoyancy tank that gave it a humped appearance. This was done to improve surface sea keeping. Unlike the Electric Boat design groups, most of which survived to serve in World War II, the Lake 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 poorly regarded design features also contributed to this.^[10][11]

Service

Most of the Electric Boat design group spent the 1920s in the Pacific, operating out of San Diego and Hawaii.^[12] In 1921 one member of this group, the R-14,^[13] was stranded at sea in the Pacific off Hawaii when it ran out of fuel during a search and rescue operation. The boat rigged makeshift sails and sailed 140 nautical miles (260 km; 160 mi) to Hilo, Hawaii.^[14] The Hawaii-based boats returned to the mainland on 18 January 1931 and were decommissioned to reserve status at the Philadelphia Navy Yard in 1931. As the war emergency in Europe became more urgent most of the boats were recommissioned in 1940, conducting patrols in the Caribbean or being used as sonar targets at Key West, Florida. They also patrolled 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 while underway off Key West. While the cause of her loss has never been definitively determined, when her wreck was found by the in 2010 by the Lost 52 Project it was suspected that the old boat suffered from a hull failure in the forward battery compartment.^[15]

In the aftermath of the S-4 disaster in 1927, all of the EB design boats were modified for greater safety. A motor room escape hatch was added, the motor room being the after most compartment. The tapered after casing became a step as a result of this modification. The boats also received salvage air connections and mating surfaces around topside hatches to allow the McCann Rescue Chamber to rescue trapped crewmen.^[16]

Electric Boat built four variants of the R class 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 1935–1936 and 1955–1956, and renamed Islay, Casma, Pacocha, and Arica in 1957. These were the first submarines built directly by Electric Boat at their newly established shipyard along the Thames River in Connecticut.^[17] They were discarded in 1960.

In December 2020, the remains of R-8 were discovered off the coast of Ocean City, Maryland.^[18] The vessel sank there in 1936, after being used for target practice by bomber aircraft.

Boats in class

The 27 submarines of the R class were:

Construction data for the Electric Boat design

Ship name and hull no.	Builder	Laid down	Launched	Commissioned	Decommissioned	Fate
USS R-1 (SS-78)	Bethlehem Quincy	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)	Bethlehem San Francisco	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 the 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

Notes

1. Shipbuildinghistory.com Bethlehem Quincy page
2. Shipbuildinghistory.com Bethlehem San Francisco page
3. PigBoats.COM Submarine Specifications page
4. PigBoats.COM R-class page
5. PigBoats.COM O-class page
6. Gardiner, p. 130
7. PigBoats.COM R-class page
8. Friedman, p. 308
9. R-22 (SS-99
10. Gardiner, p. 130
11. PigBoats.COM R-boats page
12. DANFS R-class pages
13. R-14 (SS-91)
14. Johnston & Hedman, pp. 47–69
15. PigBoats.COM R-12 page
16. PigBoats.COM R-boats page
17. Rodengen, P. 81
18. "American submarine discovered off Ocean City coast". Baltimore Sun. 10 December 2020. Retrieved 12 December 2020.

Sources

• Gardiner, Robert, Conway's All the World's Fighting Ships 1906–1921 Conway Maritime Press, 1985. ISBN 0-85177-245-5.
• Friedman, Norman (1995). U.S. Submarines Through 1945: An Illustrated Design History. Annapolis, Maryland: United States Naval Institute. ISBN 1-55750-263-3.
• Johnston, David L., and Hedman, Ric. A Good and Favorable Wind: The Unusual Story of a Submarine Under Sail and its Cautionary Lessons for the Modern Navy. Nimble Books LLC, 2022. ISBN 978-1-60888-200-7
• Rodengen, Jeffrey L., The Legend of Electric Boat Write Stuff Enterprises, Inc., 2nd Ed. 2006. ISBN 1-932022-18-X.
• Navsource.org early diesel submarines page
• PigBoats.COM R-boats page
• DiGiulian, Tony Navweaps.com early 3"/50 caliber guns
•  This article incorporates text from the public domain Dictionary of American Naval Fighting Ships. (DANFS)

External links

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