||This article includes a list of references, but its sources remain unclear because it has insufficient inline citations. (November 2011)|
HMAS Swan in 1945
|Operators:|| Royal Navy (8)
Royal Australian Navy (4)
Royal Indian Navy (1)
|Cost:||£220,000 for Australian ships|
|General characteristics RN Ships|
|Displacement:||RN ships :
990 long tons (1,006 t) standard
1,480–1,510 long tons (1,504–1,534 t)
|Length:||266 ft 3 in (81.15 m) o/a|
|Beam:||36 ft (11.0 m)|
|Draught:||RN ships : 9 ft 11 in (3.02 m) – 10 ft 1 in (3.07 m)|
|Propulsion:||Parsons geared steam turbines
2 Admiralty 3-drum water-tube boilers
2,000 shp (1,500 kW)
|Speed:||16.5 knots (19.0 mph; 30.6 km/h)|
|Armament:||2 × 4.7 in (120 mm) Mark IX
1 × QF 3 inch 20 cwt anti-aircraft gun
4 × 3-pounder
With the realisation that war was approaching, the 13 Grimsby-class sloops were laid down in the mid- to late-1930s. Of these eight were built in the United Kingdom for the Royal Navy, four in Australia for the Royal Australian Navy and one for India. Armament varied considerably between ships with the four Australian ships being similar to HMS Deptford but armed with an additional 4-inch (100 mm) gun.
The Royal Navy started to build replacements for the Flower-class and Hunt-class sloops of the First World War, when the two sloops of the Bridgewater class were laid down, with the similar four-ship Hastings class laid down in 1929 and the eight ships of the Shoreham class being laid down in 1929–31. All of these ships were designed to combine the convoy-escort role of the Flower-class with the minesweeping duties of the Hunt class, being fitted with equipment for both roles. By 1932, however, it became clear that what was needed was ships dedicated to a single role. Development therefore began of the Halcyon-class minesweepers as a cheaper mass-production minesweeper, while a new class of sloops would be built that was more closely matched to the escort role.
The new class of escort sloops, the Grimsby class, had a heavier gun armament than its predecessors, with two 4.7 in (120 mm) Mark IX guns mounted fore and aft replacing the 4-inch (102 mm) guns of the earlier ships. As the 4.7 inch guns were low-angle guns, not suited to anti aircraft use, a single QF 3 inch 20 cwt anti-aircraft gun was mounted in "B" position. Four 3-pounder saluting guns completed the ships' gun armament. The ship was powered by two geared steam turbine driving two shafts, fed by two Admiralty 3-drum boilers. This machinery produced 2,000 shaft horsepower (1,500 kW) and could propel the ships to a speed of 16.5 knots (30.6 km/h; 19.0 mph).
Eight ships of the class were built for the Royal Navy, being laid down between 1933 and 1935 and completing between 1934 and 1936. The last two ships built for the Royal Navy, HMS Aberdeen and HMS Fleetwood had differing armaments, with Aberdeen replacing the 4.7 and 3-inch guns with two 4 inch anti-aircraft guns, and adding a quadruple .50 in anti-aircraft machine gun mount, while Fleetwood had a main gun armament of two twin four inch anti-aircraft mounts, with close-in anti-aircraft armament of four .50 in machine guns.
The Royal Australian Navy also adopted the Grimsby class, with two ship being laid down in 1934–35 and completed in 1935–36, with two more ships laid down in 1938–39 and completed in 1940. The first two ships were armed with three single 4-inch anti-aircraft guns, while the third and fourth ships having one twin and one-single 4-inch mount, with close in armament a quadruple machine gun mount in all four ships.
The armament of most of the class was reinforced during the Second World War, with several gaining additional 4-inch guns, with the close in anti aircraft armament being supplemented by the addition of Oerlikon 20 mm cannon. The ships' depth charge complement increased from 15 at the start of the war to 40 for Australian ships and 90 for Royal Navy Ships, while several ships were also refitting with a Hedgehog anti-submarine projector.
|Grimsby||HM Dockyard, Devonport||1 November 1932||23 January 1933||19 July 1933||17 May 1934||Sunk in air attack off Tobruk, 25 May 1941|
|Leith||HM Dockyard, Devonport||1 November 1932||6 February 1933||9 September 1933||12 July 1934||Sold into mercantile service, 1946|
|Lowestoft||HM Dockyard, Devonport||1 May 1933||21 August 1933||11 April 1934||22 November 1934||Sold into mercantile service, 1946|
|Wellington||HM Dockyard, Devonport||1 May 1933||25 September 1933||29 May 1934||24 January 1935||Sold to Honourable Company of Master Mariners as Headquarters, 1947|
|Londonderry||HM Dockyard, Devonport||1 March 1934||11 June 1934||16 January 1935||20 September 1935||Broken up at Llanelly, 1948|
|Deptford||HM Dockyard, Chatham||10 January 1934||30 April 1934||5 February 1935||20 August 1935||Broken up at Milford Haven, 1948|
|Aberdeen||HM Dockyard, Devonport||1 March 1935||1 June 1935||22 January 1936||17 September 1936||Broken up at Hayle, 1949|
|Fleetwood||HM Dockyard, Devonport||1 March 1935||14 August 1935||24 March 1936||19 November 1936||Broken up at Gateshead, 1959|
|Royal Australian Navy|
|Yarra||Cockatoo Island Dockyard, Sydney||22 December 1933||24 May 1934||28 March 1935||21 January 1936||Sunk in surface action off Java, 4 March 1942|
|Swan||Cockatoo Island Dockyard, Sydney||2 January 1935||1 May 1935||28 March 1936||21 January 1937||Broken up at Sydney, 1964|
|Parramatta||Cockatoo Island Dockyard, Sydney||July 1938||9 November 1938||10 June 1939||8 April 1940||Sunk in torpedo attack off Tobruk, 27 November 1941|
|Warrego||Cockatoo Island Dockyard, Sydney||December 1938||15 May 1939||10 February 1940||22 August 1940||Broken up at Sydney, 1965|
|Royal Indian Navy|
|Indus||Hawthorn Leslie and Company, Hebburn||14 August 1933||8 December 1933||24 August 1934||15 March 1935||Sunk in air attack off Akyab, 6 April 1942|
|Wikimedia Commons has media related to Grimsby class sloop.|
- Gardiner, Robert; Chesneau, Roger (1980). Conway's All the World's Fighting Ships, 1922-1946. London: Conway Maritime Press. ISBN 0-85177-146-7.
- Gillet, Ross (1977). Warships of Australia. Graham, Colin (illus.). Adelaide, Australia: Rigby Limited. ISBN 0-7270-0472-7.
- Hague, Arnold (1993). Sloops: A History of the 71 Sloops Built in Britain and Australia for the British, Australian and Indian Navies 1926–1946. Kendal, England: World Ship Society. ISBN 0-905617-67-3.
- Lenton, H T (1998). British and Empire Warships of the Second World War. London: Greenhill Books. ISBN 1-85367-277-7.