Name HMS E21 Laid down 29 July 1915 Fate Sold, 14 December 1921 Length 55 m | Builder Vickers, Barrow Commissioned 1 October 1915 Class and type E class submarine Construction started 29 July 1915 | |
HMS E21 was a British E class submarine built by Vickers, Barrow-in-Furness. She was laid down on 29 July 1915 and was commissioned on 1 October 1915. E21 was sold on 14 December 1921.
Contents
Design
Like all post-E8 British E-class submarines, E21 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). E21 was capable of operating submerged for five hours when travelling at 5 knots (9.3 km/h; 5.8 mph).
E21 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.
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.
Crew
Her complement was three officers and 28 men.