Topaze-class cruiser

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HMS Amethyst (1903) IWM Q 038114.jpg
HMS Amethyst
Class overview
Operators:  Royal Navy
In commission: 1905 - 1921
Planned: 8
Completed: 4
Scrapped: 4
General characteristics
Class & type: Topaze-class protected cruiser
Displacement: 3,000 tons
Length: 360 ft (109.7 m)
Beam: 40 ft (12.2 m)
Draught: 14 ft 6 in (4.42 m)
Installed power: 10,000 - 12,000 indicated horsepower
Propulsion:

Sapphire, Topaze & Diamond

  • Steam reciprocating engines
  • 2 shafts

Amethyst:

  • Steam turbines
  • 3 shafts
Speed: 22.1 knots (40.9 km/h) - 23.6 kn (43.7 km/h)
Complement: 296
Armament:

12 x QF 4-inch (102 mm) guns
8 x 3-pounder (47-mm) guns

2 × 18-inch (450-mm) torpedo tubes
Armour: 1-inch gun shields, ½-inch to 2-inch deck armour

The Topaze-class (or "Gem-class") cruisers were a class of third-class protected cruisers. They were the last class of protected cruiser built for the Royal Navy. Four ships were built and a further 4 ships of the class were canceled before their keels were laid.

Design[edit]

Propulsion[edit]

Sapphire, Topaze and Diamond were fitted with steam reciprocating engines and twin shafts developing about 10,000 indicated horsepower (7,460 kW), and generating a top speed of about 22 knots (40.7 km/h). Amethyst was fitted with steam turbines, making her the first ship larger than a destroyer to be so fitted. She developed 12,000 ihp and was capable of 23 knots, and although her maximum range at 10 knots was reduced, she benefited from greater efficiency at high speed, and compared to her sisters, she was able to travel 1,000 nautical miles further at 20 knots.[1]

Ships[edit]

Name Builder[2] Laid Down[2] Launched[2] Commissioned[2] Cost Fate
Amethyst Armstrong Whitworth, Elswick 7 January 1903 5 November 1903 17 March 1905 £228,426[3] Sold for scrap on 1 October 1920[4]
Diamond Laird, Birkenhead 24 March 1903 6 January 1904 January 1905 £231,010[5] Sold for scrap 9 May 1921[4]
Sapphire Palmers, Jarrow 30 March 1903 17 March 1904 7 February 1905 £226,227[6] Sold for scrap 9 May 1921[4]
Topaze Laird, Birkenhead 14 August 1902 23 July 1903 November 1904 £242,444[6] Sold for scrap 22 September 1921[4]

References[edit]

  1. ^ Milford, Darren. "World War I Naval Combat". Retrieved 2011-03-15. 
  2. ^ a b c d Chesneau and Kolesnik 1979, p. 84.
  3. ^ Hythe 1912, p. 186.
  4. ^ a b c d "Gem class". battleships-cruisers.co.uk. Retrieved 23 June 2012. 
  5. ^ Hythe 1912, p. 187.
  6. ^ a b Hythe 1912, p. 191.
  • Chesneau, Robert; Kolesnik, Eugene M (1979). Conway's All the World's Fighting Ships 1860–1905. London: Conway Maritime Press. ISBN 0-85177-133-5. 
  • Viscount Hythe (1912). The Naval Annual 1912. Portsmouth, UK: J Griffin and Co. 

External links[edit]