USS R-20

	USS R-20 (SS-97) possibly in the Thames River, near New London, Connecticut, sometime between April and June 1941, note the three large white "\|" painted on the submarine's fairwater for recognition
History
United States
Name	R-20
Ordered	29 August 1916
Builder	Union Iron Works, San Francisco, California
Cost	$786,854.67 (hull and machinery)
Laid down	4 June 1917
Launched	21 January 1918
Sponsored by	Mrs. Maud Foster
Commissioned	26 October 1918
Decommissioned	15 May 1931
Recommissioned	22 January 1941
Decommissioned	27 September 1945
Stricken	11 October 1945
Identification	Hull symbol: SS-97 (17 July 1920); Call sign: NARZ; ;
Fate	Sold for scrapping, 13 March 1946
General characteristics
Class & type	R-1-class submarine
Displacement	574 long tons (583 t) surfaced; 685 long tons (696 t) submerged;
Length	186 feet 3 inches (56.77 m)
Beam	18 ft (5.5 m)
Draft	15 ft 6 in (4.72 m)
Installed power	880 brake horsepower (656 kW) diesel; 934 hp (696 kW) electric;
Propulsion	2 × NELSECO 6-EB-14 diesel engines; 2 × Electro-Dynamic Company electric motors; 2 × 60-cell batteries; 2 × Propellers;
Speed	12.5 knots (23.2 km/h; 14.4 mph) surfaced; 9.3 kn (17.2 km/h; 10.7 mph) submerged;
Range	4,700 nautical miles (8,700 km; 5,400 mi) at 6.2 kn (11.5 km/h; 7.1 mph), 7,000 nmi (13,000 km; 8,100 mi) if fuel loaded into the main ballast tanks
Test depth	200 ft (61 m)
Capacity	18,880 US gallons (71,500 L; 15,720 imp gal) fuel
Complement	2 officers ; 27 enlisted;
Armament	4 × 21-inch (533 mm) torpedo tubes (8 torpedoes); 1 × 3-inch (76 mm)/50-caliber deck gun;

USS R-20 (SS-97), also known as "Submarine No. 97", was an R-1-class coastal and harbor defense submarines of the United States Navy commissioned shortly before the end of World War I.

She was recommissioned before the US entered World War II, for use as a training boat.