The class was built to replace the ageing L-class submarines which did not have adequate endurance for use in the Pacific Ocean. These boats were theoretically able to dive to 500feet, though none were formally tested beyond 300feet. Armament consisted of eight 21adj=onNaNadj=on torpedo tubes (6 bow, 2 stern) and one 4adj=onNaNadj=on gun. The boats were of a saddle tank type with fuel carried in riveted external tanks. These external tanks proved vulnerable to leaking after depth charge damage, thus betraying the position of the submarine. These boats were the first British submarines fitted with Asdic and VLF radio which could be used at periscope depth.
Boat | Builder | Launched | Fate | |
---|---|---|---|---|
Vickers, Barrow | 7 September 1926 | Scrapped, 1945 | ||
Vickers, Barrow | 29 September 1926 | Sunk in a friendly fire incident by near Norway, 10 September 1939 |
Boat | Builder | Launched | Fate | |
---|---|---|---|---|
Chatham Dockyard | 5 May 1928 | Sunk by in the Gulf of Taranto, 14 June 1940 | ||
William Beardmore and Company | 11 December 1928 | Mined off Malta, 8 May 1942 | ||
William Beardmore and Company | 26 February 1929 | Sunk by in the Mediterranean, 19 June 1940 | ||
Vickers, Barrow | 19 May 1928 | Scrapped, September 1946, Durban. | ||
Vickers, Barrow | 19 June 1928 | Sunk by Italian destroyer Ugolino Vivaldi off Calabria, 1 August 1940 | ||
Vickers, Barrow | 31 August 1928 | Scuttled, September 1946, off Durban. |