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Career Royal Navy Ensign
Name: A9
Builder: Vickers, Sons & Maxim Ltd. Barrow-in-Furness, England
Launched: 8 March 1905
Commissioned: 8 May 1905
Fate: Sold Jan. 1920 and scrapped
General characteristics
Class & type: A class submarine
Displacement: 190 tons surfaced, 207 tons submerged
Length: 105.25 ft (32.08 m)
Beam: 12.75 ft (3.89 m)
Draught: 10.5 ft (3.2 m)

550 hp petrol engine

150 hp electric engine
Speed: 11 knots (20 km/h) maximum surfaced 8 knots (15 km/h) maximum submerged
Range: 325 nautical miles (602 km) at 11 knots (20 km/h) surfaced 20 nautical miles (40 km) at 6 knots (11 km/h) submerged
Complement: 11 (2 officers and 9 ratings)
Armament: Two 18 inch (457 mm) torpedo tubes, plus two reloads

HMS A9 was an early Royal Navy submarine.

She was a member of Group Two of the first British A-class of submarines (a second, much different A-class submarine appeared towards the end of the Second World War). Like all members of her class, she was built at Vickers Barrow-in-Furness.

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