After the coal-burning Beagle class, the Acorn-classdestroyers saw a return to oil-firing. Pioneered by the Tribal class of 1905 and HMS Swift of 1907, using oil enabled a more efficient design, leading to a smaller vessel which also had increased deck space available for weaponry.[1] Unlike previous destroyer designs, where the individual yards had been given discretion within the parameters set by the Admiralty, the Acorn class were a set, with the propulsion machinery the only major variation between the different ships.[2] This enabled costs to be reduced.[3] The class was renamed H class in October 1913.[4]
Larne was 240 ft (73 m) long between perpendiculars and 246 ft (75 m) overall, with a beam of 25 ft 5 in (7.7 m) and a deep draught of 8 ft 6 in (2.6 m). Displacement was 730 long tons (820 short tons; 740 tonnes) normal and 855 long tons (958 short tons; 869 t) full load.[5] Power was provided by Parsonssteam turbines, fed by four Yarrow boilers.[6] Parsons supplied a complex of seven turbines, a high-pressure and two low pressure for high speed, two turbines for cruising and two for running astern, driving three shafts. The high-pressure turbine drove the centre shaft, the remainder being distributed amongst two wing-shafts.[2] Three funnels were fitted, the foremost tall and thin, the central short and thick and the aft narrow.[7] The engines were rated at 13,500 shaft horsepower (10,100 kW) and design speed was 27 knots (50 km/h; 31 mph). On trial, Larne achieved 27.9 kn (51.7 km/h; 32.1 mph).[4] The vessel carried 170 long tons (170 t) of fuel oil which gave a range of 1,540 nautical miles (2,850 km; 1,770 mi) at a cruising speed of 15 kn (28 km/h; 17 mph).[5][6]
The 20 destroyers of the Acorn class were ordered by the Admiralty under the 1909–1910 Naval Programme. One of three in the class built by John I. Thornycroft & Company, Larne was laid down at the company's Woolston shipyard on 8 December 1909, launched on 23 August 1910 and completed in February 1911.[11] The ship was the third in Royal Navy service to be named after the town of Larne in Northern Ireland.[12][13]
Larne joined the Second Destroyer Flotilla.[14] On 8 August 1911, the destroyer participated in a fleet exercise in the Irish Sea that pitted two fleets against each other. Despite being part of the winning "blue" fleet, the destroyer suffered damage as the high speed manoeuvres meant that rivets were strained so much that water entered the hull, mixing with oil in the bunkers. Larne was repaired quickly and soon back in service.[15] On 9 July 1912, the destroyer took part in a naval demonstration organised by Winston Churchill, First Lord of the Admiralty, for Members of Parliament.[16]Larne remained part of the Second Destroyer Flotilla in 1913.[17]
After the British Empire declared war on Germany at the beginning of the First World War in August 1914, the flotilla became part of the Grand Fleet and the destroyers were deployed to Devonport to undertake escort duties.[6][18] Following reports of submarine activity in Loch Ròg and other areas of the Outer Hebrides on 12 and 13 November, Larne and sister shipRifleman were dispatched to the area, and found what they felt was evidence of their operation. However, this was illusionary as there were no German submarines in the area at the time.[19] On 2 February the following year, the destroyer was part of a division led by sister ship Cameleon that was transferred to Barrow-in-Furness to provide anti-submarine patrols.[20] The division was then commanded to sail with the dreadnought battleshipConqueror, which was travelling to Liverpool for repairs. Accompanying the battleship into Liverpool on 14 February and then travelling on to Scapa Flow, Larne was the only member of the division to manage the whole journey, Cameleon being damaged at Greenock and the remaining destroyers leaking and having to leave early.[21]
A year later, on 14 February 1916, Larne was recommissioned at Devonport.[22] On 28 April, while returning to Devonport from escorting merchant ships, the destroyer shot at a surfaced submarine at long range, likely to be U-45, but no hits were reported. However, the sighting was sufficient for the Admiralty to immediately halt all merchant sailing in the Irish Sea, seeing this as the only way to ensure ships were not sunk there.[23] On 9 September, after movements had resumed, the destroyer rescued the crew of the merchant ship Pronto, sunk by submarine the night before.[24] During 1917, the destroyer was transferred to the Mediterranean Fleet based at Brindisi.[25]Larne was serving with the Aegean Squadron on 20 January 1918, once again acting as an escort protecting shipping against submarines.[26]
After the Armistice, the Royal Navy returned to a peacetime level of strength and both the number of ships and personnel needed to be reduced to save money.[27]Larne was decommissioned and place in reserve at Devonport.[28] The vessel was sold to be broken up at Lelant to Thos. W. Ward on 9 May 1921.[13]
Brassey, Thomas (1912). The Navy Annual 1912. Portsmouth: J. Griffin & Co.
Brown, David K. (2010). The Grand Fleet: Warship Design and Development 1906–1922. Barnsley: Seaforth Publishing. ISBN978-1-84832-085-7.
Bush, Steve; Warlow, Ben (2021). Pendant Numbers of the Royal Navy: A Complete History of the Allocation of Pendant Numbers to Royal Navy Warships & Auxiliaries. Barnsley: Seaforth Publishing. ISBN978-1-526793-78-2.
Colledge, J. J.; Warlow, Ben (2006). Ships of the Royal Navy: A Complete Record of All Fighting Ships of the Royal Navy from the 15th Century to the Present. London: Chatham. ISBN978-1-85367-566-9.
Friedman, Norman (2009). British Destroyers: From Earliest Days to the First World War. Barnsley: Seaforth Publishing. ISBN978-1-84832-049-9.
