HMS E56
HMS E56 was a British E-class submarine built by William Denny, Dumbarton as Yard No.1033. She was laid down on 1 December 1914, launched 19 June 1916 and was delivered on 8 August 1916. E56 was sold for scrap at Granton, Edinburgh, on 9 June 1923.
Design
Like all post-E8 British E-class submarines, E56 had a displacement of at the surface and while submerged. She had a total length of and a beam of. She was powered by two eight-cylinder two-stroke diesel engines and two electric motors made by Crossley. The submarine had a maximum surface speed of and a submerged speed of. British E-class submarines had fuel capacities of of diesel and ranges of when travelling at. E56 was capable of operating submerged for five hours when travelling at.E56 was armed with a 12-pounder 12 cwt naval gun|12-pounder ] QF gun mounted forward of the conning tower. She had five 18 inch (450 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 power ratings; in some submarines, these were later upgraded to systems by removing a midship torpedo tube. Their maximum design depth was although in service some reached depths of below. Some submarines contained Fessenden oscillator systems.