British L-class submarine

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L52, L22, L20 & L6, at Gosport in 1933
Class overview
Operators	Royal Navy  Soviet Navy
Preceded by	E class
Succeeded by	Odin class
In commission	1917 - 1942
Planned	73
Completed	27
General characteristics
Type	Submarine
Displacement	Group 1 : 890 long tons (904 t) surfaced 1,074 long tons (1,091 t) submerged Group 2 : 914 long tons (929 t) surfaced 1,089 long tons (1,106 t) submerged Group 3 : 960 long tons (975 t) surfaced 1,150 long tons (1,168 t) submerged[1]
Length	Group 1 : 222 ft (67.7 m) Group 2 : 228 ft (69.5 m) Group 3 : 230 ft 6 in (70.3 m)
Beam	23 ft 6 in (7.16 m)
Speed	Surfaced Group 1 : 17.3 knots (32.0 km/h; 19.9 mph) Group 2 : 17 knots (31 km/h; 20 mph) Group 3 : 17.5 knots (32.4 km/h; 20.1 mph) Submerged 10.5 knots (19.4 km/h; 12.1 mph)
Range	Group 1 & 2 : 2,800 nmi (5,200 km) at 10 kn (19 km/h; 12 mph) surfaced Group 3 : 4,800 nmi (8,900 km) at 8 kn (15 km/h; 9.2 mph) surfaced[1]
Complement	Group 1 : 35 Group 2 : 38 Group 3 : 44
Armament	Group 1 : 6 × 18-inch (450 mm) torpedo tubes (4 bow, 2 beam) 10 × 18-inch torpedoes 1 × 4-inch gun Group 2 : 4 × 21-inch (533 mm) bow torpedo tubes 2 × 18-inch (450 mm) beam torpedo tubes 8 × 21-inch and 2 × 18-inch torpedoes 1 × 4-inch gun or 4 × 21-inch (533 mm) torpedo tubes (bow) 16 × mines 1 × 4-inch gun Group 3 : 6 × 21-inch (533 mm) torpedo tubes (bow) 12 × 21-inch (533 mm) torpedoes 2 × 4-inch (102 mm) guns[1]

The British L-class submarine was originally planned under the emergency war programme as an improved version of the British E-class submarine. The scale of change allowed the L class to become a separate class.

The armament was increased when the 21-inch torpedoes came into service. The Group 3 boats had two QF 4-inch guns fore and aft of the lengthened conning tower. Also, 76 tons of fuel oil was carried in external wing tanks for the first time in British submarines. Several of the Group 1 boats were configured as minelayers including L11 and L12. In the Group 2 boats, L14, L17 and L24 to L27 were built as minelayers carrying 16 mines but without the two beam torpedo tubes.

The introduction of the L class came too late to contribute significantly in World War I. L2 was accidentally depth-charged by three American destroyers in early 1918. L12 torpedoed the German submarine UB-90. L10 torpedoed the German destroyer S33 in October 1918 but was sunk by accompanying destroyers. L24 was sunk with all hands lost in a collision with the battleship Resolution during an exercise off Portland Bill in the English Channel on 10 January 1924.

L55 was sunk in 1919 during the British naval intervention in the Russian civil war by Bolshevik Russian destroyers. She was salvaged by the Russians and who re-commissioned her with the same name.

The L class served throughout the 1920s and the majority were scrapped in the 1930s but three remained operational as training boats during World War II. The last three were scrapped in 1946.

Parts of uncompleted L-class submarines were used for the Yugoslav Hrabri-class submarines.