HMS E25

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History
Name: HMS E23
Ordered: 29 April 1914
Builder: William Beardmore, Dalmuir
Laid down: November 1914
Launched: 23 August 1915
Commissioned: 4 October 1915
Fate: Sold, 14 December 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) diesel
  • 2 × 420 hp (313 kW) electric
  • 2 screws
Speed:
  • 15 knots (28 km/h; 17 mph) surfaced
  • 10 knots (19 km/h; 12 mph) submerged
Range:
  • 3,000 nmi (5,600 km) at 10 kn (19 km/h; 12 mph) surfaced
  • 65 nmi (120 km) at 5 kn (9.3 km/h; 5.8 mph) surfaced
Complement: 31
Armament:

HMS E25 was a British E class submarine built by William Beardmore and Company, Dalmuir. She was, along with the future E26, one of a pair of submarines ordered by the Ottoman Navy on 29 April 1914, but was taken over by the Royal Navy and assigned the E25 name. She was laid down in November 1914, launched on 23 August 1915, and was commissioned on 4 October 1915. HMS E25 was sold on 14 December 1921.[1]


Design[edit]

Like all post-E8 British E-class submarines, E25 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)[1] 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.[2][3] 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).[1] E20 was capable of operating submerged for five hours when travelling at 5 knots (9.3 km/h; 5.8 mph).

E25 was armed with a 12-pounder QF gun, mounted forward of the conning tower. 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.[2]

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.[1]

Crew[edit]

Her complement was three officers and 28 men.[1]

References[edit]

  1. ^ a b c d Innes McCartney; Tony Bryan (20 February 2013). British Submarines of World War I. Osprey Publishing. pp. 11–12. ISBN 978-1-4728-0035-0. 
  2. ^ a b Akerman, P. (1989). Encyclopaedia of British submarines 1901–1955.  p.150. Maritime Books. ISBN 1-904381-05-7
  3. ^ "E Class". Chatham Submarines. Retrieved 20 August 2015. 

Bibliography[edit]