USS R-6

	USS R-6 underway while testing the first experimental U.S. Navy submarine snorkel in 1945.
History
United States
Name	R-3
Ordered	29 August 1916
Builder	Fore River Shipbuilding Company, Quincy, Massachusetts
Cost	$717,188.00 (hull and machinery)
Laid down	17 December 1917
Launched	1 March 1919
Sponsored by	Miss Katharine Langdon Hill
Commissioned	1 May 1919
Decommissioned	4 May 1931
Recommissioned	15 November 1940
Decommissioned	7 September 1945
Stricken	11 October 1945
Identification	Hull symbol: SS-83 (17 July 1920); Call sign: NILK; ;
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-6 (SS-83), also known as "Submarine No. 83", was an R-1-class coastal and harbor defense submarines of the United States Navy commissioned after the end of World War I.

Due to space constraints, the boats built at the Fore River Shipbuilding Company yard, were laid down much later than the boats built at the Union Iron Works and the Lake Torpedo Boat Company yards. Because of this, none were commissioned before the end of WWI.