HMS E11

HMS E11 off the Dardanelles in 1915
History
Name:	HMS E11
Launched:	23 April 1914
Fate:	Sold for scrap, Malta, March 1921
General characteristics
Class and type:	E class submarine
Displacement:	662 long tons (673 t) surfaced 807 long tons (820 t) submerged
Length:	181 ft (55 m)
Beam:	15 ft (4.6 m)
Propulsion:	2 × 800 hp (597 kW) diesels 2 × 420 hp (313 kW) electric 2 screws
Speed:	15.25 knots (28.24 km/h; 17.55 mph) surfaced 10.25 knots (18.98 km/h; 11.80 mph) submerged
Range:	3,000 nmi (5,600 km) at 10 kn (19 km/h; 12 mph) 65 nmi (120 km) at 5 kn (9.3 km/h; 5.8 mph)
Complement:	30
Armament:	5 × 18 in (457 mm) torpedo tubes (2 bow, 2 beam, 1 stern) 1 × 12-pounder gun

HMS E11 was an E-class submarine of the Royal Navy launched on 23 April 1914. E11 was one of the most successful submarines in action during the 1915 naval operations in the Dardanelles Campaign, sinking over 80 vessels of all sizes in three tours of the Sea of Marmara.

Like all post-E8 British E-class submarines, E11 had a displacement of 662 tonnes (730 short tons) at the surface and 807 tonnes (890 short tons) while submerged. She had a total length of 180 feet (55 m) and a beam length of 22 feet 8.5 inches (6.922 m). She was powered by two 800 horsepower (600 kW) Vickers eight-cylinder two-stroke diesel engines and two 420 horsepower (310 kW) electric motors. The submarine had a maximum surface speed of 16 knots (30 km/h; 18 mph) and a submerged speed of 10 knots (19 km/h; 12 mph). British E-class submarines had fuel capacities of 50 tonnes (55 short tons) of diesel and ranges of 3,255 miles (5,238 km; 2,829 nmi) when travelling at 10 knots (19 km/h; 12 mph).E11 was capable of operating submerged for five hours when travelling at 5 knots (9.3 km/h; 5.8 mph).

E11 was initially armed with a single 6-pounder QF gun mounted forward of the conning tower, but this was later replaced by a 12-pounder QF. She had five 18 inches (460 mm) torpedo tubes, two in the bow, one either side amidships, and one in the stern; a total of 10 torpedoes were carried.

E-Class submarines had wireless systems with 1 kilowatt (1.3 hp) power ratings; in some submarines, these were later upgraded to 3 kilowatts (4.0 hp) systems by removing a midship torpedo tube. Their maximum design depth was 100 feet (30 m) although in service some reached depths of below 200 feet (61 m). Some submarines contained Fessenden oscillator systems.

Her complement was three officers and 28 men.

In September 1914, Havmanden, a submarine of neutral Denmark displaying her pennant number of 3 on her conning tower, was mistaken for the German U-boat SM U-3 by E11. A launched torpedo from E11 that missed its mark spared Havmanden.