"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 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
Name	Builder	Laid Down	Launched	Completed	Fate
J 1	Portsmouth Royal Dockyard		6 Nov, 1915		to Australia 25 Mar, 1919
J 2	Portsmouth Royal Dockyard		6 Nov, 1915		to Australia 25 Mar, 1919
J 3	Pembroke Royal Dockyard		4 Dec, 1915		to Australia 25 Mar, 1919
J 4	Pembroke Royal Dockyard		2 Feb, 1916		to Australia 25 Mar, 1919
J 5	Devonport Royal Dockyard		9 Sep, 1915		to Australia 25 Mar, 1919
J 6	Devonport Royal Dockyard		9 Sep, 1915		Sunk 15 Oct, 1918
J 7	Devonport Royal Dockyard		21 Feb, 1917		Sold Nov, 1929

Radio

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.

Torpedoes

• six 18-in tubes (four forward, two broadside), twelve torpedoes

Guns

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

See Also

• Wikipedia

Bibliography

• 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).