|Launched:||14 November 1905|
|Completed:||28 January 1906|
|Fate:||Sold for scrap, 1 April 1919|
|Class and type:||B-class submarine|
|Length:||142 ft 3 in (43.4 m)|
|Beam:||12 ft 7 in (3.8 m)|
|Draught:||11 ft 2 in (3.4 m)|
|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|
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
B4 collided with a dredger when entering Portsmouth harbour on 21 July 1906 and was badly damaged as a result, having to be beached before being taken into dry dock for repair. When the war began in 1914, the boat was assigned to defend the Straits of Dover. B4 was sold for breaking up on 1 April 1919 to the Ardrossan Dry Dock Co.
- Gardiner & Gray, p. 87
- Akermann, p. 123
- Harrison, Chapter 27
- Harrison, A. N. (2018) [1979, London: Ministry of Defence]. "Appendix I: List of RN Submarines in the 1901 to 1936 Programmes" (PDF). BR3043: The Development of British Submarines: From Holland No. 1 (1901) to HMS Porpoise (1930). RN Subs: Website of the Barrow Submariners Association. Retrieved 25 March 2018.
- "Naval Matters—Past and Prospective: Portsmouth Dockyard". The Marine Engineer and Naval Architect. Vol. 29. 1 September 1906. p. 41.
- Akermann, Paul (2002). Encyclopaedia of British Submarines 1901–1955 (reprint of the 1989 ed.). Penzance, Cornwall: Periscope Publishing. ISBN 1-904381-05-7.
- Colledge, J. J.; Warlow, Ben (2006) . Ships of the Royal Navy: The Complete Record of all Fighting Ships of the Royal Navy (Rev. ed.). London: Chatham Publishing. ISBN 978-1-86176-281-8. OCLC 67375475.
- Gardiner, Robert & Gray, Randal, eds. (1984). Conway's All the World's Fighting Ships: 1906–1921. Annapolis, Maryland: Naval Institute Press. ISBN 0-85177-245-5.
- Harrison, A. N. (January 1979). "The Development of HM Submarines From Holland No. 1 (1901) to Porpoise (1930) (BR3043)". Submariners Association: Barrow in Furness Branch. Archived from the original on 19 May 2015. Retrieved 19 August 2015.
- Wilson, Michael (1981). "The British 'B' Class Submarine". In Roberts, John. Warship Volume V. London: Conway Maritime Press. pp. 38–44, 74–79. ISBN 0-85177-244-7.