The Beagle class (officially redesignated as the G class in 1913) was a class of sixteen destroyers of the Royal Navy, all ordered under the 1908-1909 programme and launched in 1909 and 1910. The Beagles served during World War I, particularly during the Dardanelles Campaign of 1915.
Design
For the 1908–1909 shipbuilding programme, the British Admiralty decided to revert to a smaller, more affordable destroyer to follow-on from the large and fast (required to reach ) and the experimental . The destroyers needed sufficient range to operate across the North Sea in the event of a confrontation with Germany, which rendered the coastal destroyers which had been built as a low-cost supplement to the expensive Tribals outdated, requiring larger numbers of a cheaper standard destroyer. While the Tribals were oil fuelled, it was decided to return to the use of coal for the new destroyers, because of concerns over the availability of oil stocks in the event of a war and to reduce costs. They were the last British destroyers to be so fueled.
The Beagles were not built to a standard design, with detailed design being left to the builders of individual ships in accordance with a loose specification. They were between and long between perpendiculars, with a beam of between and , with an average draught of . It was expected that the ships would displace but the builder's designs came out heavier, Three funnels were fitted.
The Beagle class was designed to carry a gun armament of five 12-pounder (76 mm) guns, with two mounted side by side on a raised platform on the ship's forecastle, two on the ship's beams, with the port gun mounted ahead of the starboard gun and one aft. While the ships were building, however, it was decided to replace the two forecastle guns by a single gun, giving a gun armament of one BL 4 inch naval gun Mk VIII and three QF 12-pounder 12 cwt guns) Torpedo armament consisted of two torpedo tubes, with one between the ship's funnels and the aft gun, and one right aft at the stern of the ship. These torpedoes had a range of at or at . Two spare torpedoes were carried.
Wartime modifications included replacement of the aft torpedo tube by a 3-pounder (47 mm) anti-aircraft gun in some ships,
The Beagles were followed, in the 1909–10 Programme, by the (later known as the H class).
Service
As the Beagles completed in 1910, they joined the 1st Destroyer Flotilla of the Royal Navy's Home Fleet. where they formed the 5th Flotilla, remaining there on the outbreak of the First World War. The Beagle class spent most of the war in the Mediterranean, with several taking part in the Dardanelles Campaign. Late in 1917, the ships of the class were recalled to British waters, where three ships were lost to accidents, two by running aground and one to collision. || Sold for breaking up 1 November 1921.
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| || John Brown and Company, Clydebank || 30 March 1909 || 13 November 1909, || 7 July 1910.
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| || R. W. Hawthorn Leslie & Company, Hebburn || 9 March 1909 || 11 February 1910 || August 1910.
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| || Cammell Laird & Company, Birkenhead || 20 April 1909 || 13 November 1909 || September 1910.
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| || Harland & Wolff, Glasgow || 29 April 1909 || 14 March 1910 || September 1910. not being noted as having been renamed until the January 1914 edition.|group=lower-alpha freeing up the original name for a submarine. Sold for breaking up 21 September 1920.
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| || John I. Thornycroft & Company, Woolston || 2 March 1909 || 10 March 1910 || August 1910. || Sold for breaking up 1 November 1921.