HMS B7

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History
United Kingdom
Name: HMS B7
Builder: Vickers
Launched: 30 November 1905
Completed: 27 March 1906
Fate: Sold 31 October 1919
General characteristics
Class and type: B-class submarine
Displacement:
  • 287 long tons (292 t) surfaced
  • 316 long tons (321 t) submerged
Length: 142 ft 3 in (43.4 m)
Beam: 12 ft 7 in (3.8 m)
Draught: 11 ft 2 in (3.4 m)
Installed power:
  • 600 bhp (450 kW) petrol
  • 180 hp (130 kW) electric
Propulsion:
Speed:
  • 12 kn (22 km/h; 14 mph) surfaced
  • 6.5 kn (12.0 km/h; 7.5 mph) submerged
Range: 1,000 nmi (1,900 km; 1,200 mi) at 8.7 kn (16.1 km/h; 10.0 mph) on the surface
Test depth: 100 feet (30.5 m)
Complement: 2 officers and 13 ratings
Armament: 2 × 18 in (450 mm) bow torpedo tubes

HMS B7 was one of 11 B-class submarines built for the Royal Navy in the first decade of the 20th century. The boat survived the First World War and was sold for scrap in 1919.

Design and description[edit]

The B class was an enlarged and improved version of the preceding A class. The submarine had a length of 142 feet 3 inches (43.4 m) overall, a beam of 12 feet 7 inches (3.8 m) and a mean draft of 11 feet 2 inches (3.4 m). They displaced 287 long tons (292 t) on the surface and 316 long tons (321 t) submerged. The B-class submarines had a crew of two officers and thirteen ratings.[1]

For surface running, the boats were powered by a single 16-cylinder 600-brake-horsepower (447 kW) Vickers petrol engine that drove one propeller shaft. When submerged the propeller was driven by a 180-horsepower (134 kW) electric motor. They could reach 12 knots (22 km/h; 14 mph) on the surface and 6.5 knots (12.0 km/h; 7.5 mph) underwater.[1] On the surface, the B class had a range of 1,000 nautical miles (1,900 km; 1,200 mi) at 8.7 knots (16.1 km/h; 10.0 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]

B7 was built by Vickers at their Barrow-in-Furness shipyard, launched 30 November 1905 and completed 27 March 1906. The boat was deployed to the Mediterranean soon after the outbreak of World War I. Due to the lack of spare parts this group of submarines was not used after September 1915. In 1917 the Italian Navy converted B7 into surface patrol boat S7 to serve in the Adriatic. The boat was sold on 31 October 1919 in Malta.

Notes[edit]

  1. ^ a b Gardiner & Gray, p. 87
  2. ^ Akermann, p. 123
  3. ^ Harrison, Chapter 27

References[edit]