Name HMS B7 Completed 27 March 1906 Class and type B-class submarine Length 43 m | Builder Vickers Fate Sold 31 October 1919 Launched 30 November 1905 | |
Displacement 287 long tons (292 t) surfaced
316 long tons (321 t) submerged | ||
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.
Contents
Design and description
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.
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. 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).
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.
Construction and career
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 to surface patrol boat S7 to serve in the Adriatic. The boat was sold on 31 October 1919 in Malta.