Arethusa-class cruiser (1913)

The earlier scout cruisers were too slow to accomplish their intended duties of working with destroyer flotillas and defending the fleet against attacks by enemy destroyers. The primary emphasis of the Arethusa-class cruisers was a design speed of 30 knots (56 km/h; 35 mph), to allow them to lead destroyers in combat. In support of this goal, they were the first cruisers to use destroyer-type high-speed steam turbines and oil-fired boilers were chosen to save weight and increase their power to meet the specification. They retained the side protection introduced in the later ships of the previous Town class, but reverted to a mixed main armament that was a feature of the earlier ships of that class.[1]

The ships were 456 feet 6 inches (139.1 m) long overall, with a beam of 49 feet 10 inches (15.2 m) and a deep draught of 15 feet 3 inches (4.6 m). Displacement was 5,185 long tons (5,268 t) at normal[2] and 5,795 long tons (5,888 t) at full load. The Arethusa class were powered by four direct-drive steam turbines, each driving one propeller shaft, which produced a total of 40,000 indicated horsepower (30,000 kW) and gave a speed of about 28.5 knots (52.8 km/h; 32.8 mph).[3] The six ships that used Parsons turbines were equipped with cruising turbines on the outer shafts, but the two ships that used Brown-Curtis turbines were not so fitted. The turbines used steam generated by eight Yarrow boilers at a working pressure of 235 psi (1,620 kPa; 17 kgf/cm²).[4] They carried 840 long tons (853 t) tons of fuel oil[2] that gave the ships with cruising turbines a range of 5,000 nautical miles (9,300 km; 5,800 mi) and 3,200 nmi (5,900 km; 3,700 mi) for those without, both at 16 knots (30 km/h; 18 mph).[5]

The main armament of the Arethusa-class ships was two BL 6-inch (152 mm) Mk XII guns that were mounted on the centreline fore and aft of the superstructure and six QF 4-inch Mk V guns in waist mountings. They were also fitted with a single QF 3-pounder 47 mm (1.9 in) anti-aircraft gun and four 21 in (533 mm) torpedo tubes in two twin mounts.[3]

View from the bow of HMS Royalist

• Arethusa, built by Chatham Dockyard, laid down 28 October 1912, launched 25 October 1913, and completed August 1914. She was sunk by mine off Felixstowe on 11 February 1916.
• Aurora, built by Devonport Dockyard, laid down 24 October 1912, launched 30 September 1913, and completed September 1914. She took part in the sinking of the German raider Meteor on 9 August 1915, was transferred to the Royal Canadian Navy in November 1920, and for sold for breaking up in August 1927.
• Galatea, built by William Beardmore and Company, Dalmuir, laid down 9 January 1913, launched 14 May 1914, and completed December 1914. She also took part in the sinking of the German raider Meteor on 9 August 1915, and was sold for breaking up 25 October 1921.
• Inconstant, built by Beardmore, laid down 3 April 1913, launched 6 July 1914, and completed January 1915. She was sold for breaking up 9 June 1922.
• Penelope, built by Vickers, Barrow in Furness, laid down 1 February 1913, launched 25 August 1914, and completed December 1914. She was damaged by a torpedo from the German submarine UB-29 on 25 April 1916, but repaired, and was sold for breaking up in October 1924.
• Phaeton, built by Vickers, laid down 12 March 1913, launched 21 October 1914, and completed February 1915. She fought at the Dardanelles in 1915, and was sold for breaking up 16 January 1923.
• Royalist, built by Beardmore, laid down 3 June 1913, launched 14 January 1915, and completed March 1915. She was sold for breaking up 24 August 1922.
• Undaunted, built by Fairfield Shipbuilding and Engineering Company, Govan, laid down 21 December 1912, launched 28 April 1914, and completed August 1914. She took part in the Battle off Texel on 17 October 1914, and was sold for breaking up 9 April 1923.

Galatea, Inconstant, Phaeton and Royalist fought in the battle of Jutland on 31 May 1916.

• Brown, David K. (1983). "The Design of HMS Arethusa 1912". Warship International. Toledo, Ohio: International Naval Research Organization. XX (1): 35–40. ISSN 0043-0374.
• Brown, David K. (2010). The Grand Fleet: Warship Design and Development 1906–1922. Barnsley, UK: Seaforth Publishing. ISBN 978-1-84832-085-7.
• Colledge, J. J.; Warlow, Ben (2006) [1969]. Ships of the Royal Navy: The Complete Record of all Fighting Ships of the Royal Navy (Rev. ed.). London: Chatham Publishing. ISBN 978-1-86176-281-8.
• Corbett, Julian. Naval Operations to the Battle of the Falklands. History of the Great War: Based on Official Documents. I (2nd, reprint of the 1938 ed.). London and Nashville, Tennessee: Imperial War Museum and Battery Press. ISBN 0-89839-256-X.
• Corbett, Julian (1997). Naval Operations. History of the Great War: Based on Official Documents. II (reprint of the 1929 second ed.). London and Nashville, Tennessee: Imperial War Museum in association with the Battery Press. ISBN 1-870423-74-7.
• Friedman, Norman (2010). British Cruisers: Two World Wars and After. Barnsley, South Yorkshire, UK: Seaforth. ISBN 978-1-59114-078-8.
• Friedman, Norman (2011). Naval Weapons of World War One. Barnsley, South Yorkshire, UK: Seaforth. ISBN 978-1-84832-100-7.
• Gardiner, Robert & Gray, Randal, eds. (1985). Conway's All the World's Fighting Ships: 1906–1921. Annapolis, Maryland: Naval Institute Press. ISBN 0-85177-245-5.
• Newbolt, Henry (1996). Naval Operations. History of the Great War Based on Official Documents. V (reprint of the 1931 ed.). Nashville, Tennessee: Battery Press. ISBN 0-89839-255-1.
• Pearsall, Alan (1984). "Arethusa Class Cruisers, Part I". Warship. London: Conway Maritime Press. VIII: 203–11. ISBN 0-87021-983-9.
• Pearsall, Alan (1984). "Arethusa Class Cruisers, Part II". Warship. London: Conway Maritime Press. VIII: 258–65. ISBN 0-87021-983-9.

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