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USS R-22

USS R-22 (SS-99), also known as "Submarine No. 99", was an R-21-class coastal and harbor defense submarines of the United States Navy commissioned after the end of World War I.

The R-boats built by the Lake Torpedo Boat Company, R-21 through R-27, are sometimes considered a separate class, R-21-class, from those built by the Fore River Shipbuilding Company, R-1 through R-14, and the Union Iron Works, R-15 through R-20, R-1-class.

The submarines had a length of 175 feet (53.3 m) overall, a beam of 16 ft 7 in (5.1 m), and a mean draft of 13 ft 11 in (4.2 m). They displaced 497 long tons (505 t) on the surface and 652 long tons (662 t) submerged. The R-21-class submarines had a crew of 3 officers and 23 enlisted men. They had a diving depth of 200 ft (61.0 m).

For surface running, the boats were powered by two 500-brake-horsepower (373 kW) Busch-Sulzer diesel engines, each driving one propeller shaft. When submerged each propeller was driven by a 400-horsepower (298 kW) Diehl Manufacture Company electric motor. They could reach 14 knots (26 km/h; 16 mph) on the surface and 11 kn (20 km/h; 13 mph) underwater. On the surface, the R-21-class had a range of 3,523 nautical miles (6,525 km; 4,054 mi) at 11 kn (20 km/h; 13 mph), or 6,499 nmi (12,036 km; 7,479 mi) if fuel was loaded into their main ballast tanks.

The boats were armed with four 21-inch (533 mm) torpedo tubes in the bow. They carried four reloads, for a total of eight torpedoes. The R-21-class submarines were also armed with a single 3 in (76 mm)/50 caliber deck gun.

R-22's keel was laid down on 19 April 1917, by the Lake Torpedo Boat Company, in Bridgeport, Connecticut. She was launched on 23 September 1918, sponsored by Mrs. Agnes Eklund, and commissioned on 1 August 1919.

Following commissioning, R-22 operated in the New London, Connecticut-Newport, Rhode Island, area for two months. On 1 November 1919, she headed south for Coco Solo, in the Panama Canal Zone, her homeport.

When the US Navy adopted its hull classification system on 17 July 1920, she received the hull number SS-99.

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1918 R-class submarine
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