HMS B9
| History | |
|---|---|
 United Kingdom
|
|
| Name: | HMS B9 |
| Builder: | Vickers |
| Launched: | 24 January 1906 |
| Completed: | 28 April 1906 |
| Fate: | Sold 31 October 1919 |
| General characteristics | |
| Class and type: | B-class submarine |
| Displacement: |
|
| 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: | |
| Propulsion: |
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| Speed: |
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| 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 B9 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.
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.
B9 was built by Vickers at their Barrow-in-Furness shipyard, launched 24 January 1906 and completed 28 April 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 were not used after September 1915. In 1917 the Italian Navy converted B9 into to surface patrol boat S9 to serve in the Adriatic. On 29 March 1916 B9 was attacked by Austrian aircraft. The boat was sold on 31 October 1919 in Malta to Messrs. Francotosti.
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