HMS A12

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History
United Kingdom
Name: A12
Builder: Vickers, Sons & Maxim Ltd. Barrow-in-Furness, England
Launched: 8 March 1905
Commissioned: 22 June 1908
Fate: Sold for scrap, 16 January 1920
General characteristics
Class and type: A-class submarine
Displacement:
  • 190 long tons (193 t) surfaced
  • 206 long tons (209 t) submerged
Length: 105 ft (32.0 m)
Beam: 12 ft 9 in (3.9 m)
Draught: 10 ft 8 in (3.3 m)
Installed power:
Propulsion:
  • 1 × 16-cylinder Wolseley petrol engine
  • 1 × electric motor
Speed:
  • 11 knots (20 km/h; 13 mph) surfaced
  • 6 knots (11 km/h; 6.9 mph) submerged
Range: 500 nautical miles (930 km; 580 mi) at 10 kn (19 km/h; 12 mph) surfaced
Complement: 2 officers and 9 ratings
Armament: 2 × 18-inch (45 cm) torpedo tubes

HMS A12 was an A-class submarine built for the Royal Navy in the first decade of the 20th century. After surviving World War I, she was sold for scrap in 1920.

Design and description[edit]

A12 was a member of the first British class of submarines, although slightly larger, faster and more heavily armed than the lead ship, HMS A1. The submarine had a length of 105 feet 1 inch (32.0 m) overall, a beam of 12 feet 9 inches (3.9 m) and a mean draft of 10 feet 8 inches (3.3 m). They displaced 190 long tons (190 t) on the surface and 206 long tons (209 t) submerged. The A-class submarines had a crew of 2 officers and 11 ratings.[1]

For surface running, the boats were powered by a single 16-cylinder 600-brake-horsepower (447 kW) Wolseley petrol engine that drove one propeller shaft. When submerged the propeller was driven by a 150-horsepower (112 kW) electric motor. They could reach 11 knots (20 km/h; 13 mph) on the surface and 6 knots (11 km/h; 6.9 mph) underwater.[1] On the surface, A12 had a range of 500 nautical miles (930 km; 580 mi) at 10 knots (19 km/h; 12 mph); submerged the boat had a range of 30 nautical miles (56 km; 35 mi) at 5 knots (9.3 km/h; 5.8 mph).[2]

The boats were armed with two 18-inch (45 cm) torpedo tubes in the bow. They could carry a pair of reload torpedoes, but generally did not as they would have to remove an equal weight of fuel in compensation.[3]

Construction and career[edit]

A12 was ordered as part of the 1903–04 Naval Programme from at Vickers.[4] She was laid down at the shipyard in Barrow-in-Furness in 1903, launched on 3 March 1905 and completed on 23 September.[2]

Notes[edit]

  1. ^ a b Gardiner & Gray, p. 86
  2. ^ a b Akermann, p. 120
  3. ^ Harrison, Chapter 27
  4. ^ Harrison, Chapter 3

References[edit]

External links[edit]