A-class submarine (1903)

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HMS A1
Class overview
Name	A-class
Builders	Vickers, Barrow-in-Furness
Operators	Royal Navy
Preceded by	Holland class
Succeeded by	B-class
Completed	13
General characteristics (A8–A13)[1]
Type	Submarine
Displacement	190 tons surfaced 207 tons submerged
Length	105 ft 0+1⁄2 in (32.02 m)
Beam	12 ft 8+3⁄4 in (3.88 m)
Draught	10 ft 8 in (3.25 m) surfaced
Propulsion	16 cylinder Wolseley 600 hp (450 kW) petrol engine 150 hp (110 kW) electric motor
Speed	11+1⁄2 kn (21.3 km/h; 13.2 mph) surfaced 6 kn (11 km/h; 6.9 mph) dived
Complement	11
Armament	2 × 18 in (460 mm) torpedo tubes (bow, four torpedoes)

The A-class was the Royal Navy's first class of British-designed submarines. Thirteen were built by Vickers at Barrow-in-Furness between 1902 and 1905 as an improvement on the US Plunger class.