"J" Class Submarine (1915)
Seven "J" Class Submarines were completed during the war. All served in the Royal Navy except J 7, which was in the Royal Australian Navy. The Royal Navy considered these to be "patrol" (as opposed to coastal or fleet) submarines, costing 25% more than the "G" class boats. The five surviving units were transferred to the Australian service after the war.
|Overview of 7 vessels|
|Citations for this data available on individual ship pages|
|J 1||Portsmouth Royal Dockyard||6 Nov, 1915||Apr, 1916||to Australia 25 Mar, 1919|
|J 2||Portsmouth Royal Dockyard||6 Nov, 1915||Jul, 1916||to Australia 25 Mar, 1919|
|J 3||Pembroke Royal Dockyard||4 Dec, 1915||Jun, 1916||to Australia 25 Mar, 1919|
|J 4||Pembroke Royal Dockyard||2 Feb, 1916||Jul, 1916||to Australia 25 Mar, 1919|
|J 5||Devonport Royal Dockyard||9 Sep, 1915||Jun, 1916||to Australia 25 Mar, 1919|
|J 6||Devonport Royal Dockyard||9 Sep, 1915||Aug, 1916||Sunk 15 Oct, 1918|
|J 7||Devonport Royal Dockyard||21 Feb, 1917||Sep, 1917||Sold Nov, 1929|
The Grand Fleet Battle Orders specified that the top speed on the surface was 19.5 knots, but that a more realistic "sea-going speed" was 16 knots.
By war's end, all boats of "E" class and later were given 3 kilowatt Poulsen wireless sets, affording ranges of 200 miles submarine-to-submarine, and 300-400 miles between shore stations and submarines. Reception of shore stations of 400 miles was common, and high power shore stations could be received over 500-600 miles.
- six 18-in tubes (four forward, two broadside), twelve torpedoes
J 1 - J 4 :
- one 12-pdr
- one 3-in H.A.
J 5 - J 7:
- one 12-pdr H.A.
- one 2-pdr
Later, all boats were rearmed with 4-in guns.
- The Technical History and Index, Vol. 3, Part 21. p. 11.
- Golding. Grand Fleet Battle Orders. p. 46.
- The Technical History and Index, Vol. 3, Part 21. pp. 16-17.
- The Technical History and Index, Vol. 4, Part 28. p. 19.
- Conway's All the World's Fighting Ships 1906–1921. p. 91.
- Gray, Randal (editor) (1985). Conway's All the World's Fighting Ships 1906–1921. London: Conway Maritime Press. (on Amazon.com and Amazon.co.uk).
|"J" Class Submarine|
|J 1||J 2||J 3||J 4||J 5|
|J 6||J 7|
|<–||"G" Class||Submarines (UK)||"K" Class||–>|