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| Typical Characteristics (HMS A2)
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| Displacement:
| 190 tons surfaced
207 tons submerged
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| Length:
| 105.25 feet (32 m)
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| Beam:
| 12.75 feet (3.9 m)
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| Draught:
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| Propulsion:
| 16 cylinder Wolseley 450 hp (336 kW) gasoline engine, 150 horsepower (112 kW) electric motor
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| Speed:
| maximum 10.5 knots (19 km/h) surfaced
maximum 7 knots (13 km/h) dived
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| Range:
| 360 nautical miles (667 km) at 10.5 knots (19 km/h) surfaced
20 nautical miles (37 km) submerged at 5 knots (9 km/h)
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| Complement:
| 11 (2 officers and 9 ratings)
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| Armament:
| Two 18 inch (457 mm) torpedo tubes plus two reloads
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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. While there was considerable variation amongst the boats of the class, they were around 100 ft (30 m) long and displaced around 200 tons when submerged. All of the class were powered on the surface by petrol engines and had either been been lost at sea or sold for breaking by 1920.
