Danae-class cruiser

Delhi
Class overview
Name	Danae class
Operators	Royal Navy Polish Navy
Preceded by	C class
Succeeded by	Emerald class
In commission	1918–1946
Planned	12
Completed	8
Cancelled	4
Lost	3
General characteristics
Type	Light cruiser
Displacement	4,850 tons standard 5,925 tons full
Length	445 ft (135.6 m) (p/p) 472.5 ft (144.0 m) (o/a)
Beam	46.5 ft (14.2 m) (47 ft (14 m) in Despatch and Diomede)
Draught	14.5 ft (4.4 m) (16.5 ft (5.0 m) full)
Propulsion	Six Yarrow-type water-tube boilers Parsons (Brown-Curtis in Dauntless, Diomede) geared steam turbines Two shafts 40,000 shp (30,000 kW)
Speed	29 knots (54 km/h; 33 mph) (27 knots full)
Range	2,300 nmi (4,260 km) at 27 knots (50.0 km/h)
Complement	450 / 469 war
Armament	6 × BL 6-inch (152.4 mm) L/45 Mark XII guns on single mountings CP Mark XIV (Diomede 1 × mount CP Mk.XVI) 2 × QF 3 inch 20 cwt L/45 Mk.I on mounts HA Mk.II 2 × QF 2-pounder L/39 Mk.II on mounts HA Mk.II 4 × triple tubes for 21-inch (533 mm) torpedoes
Armour	Main belt: 1.5–2.25 in (38–57 mm) forward 3 in (76 mm) amidships 2.25–2 in (57–51 mm) aft Upper deck:1 in (25 mm) over machinery Main deck: 1 in over steering gear Gunshields: 1 in

The Danae or D class consisted of a dozen light cruisers built for the Royal Navy at the end of World War I which also saw service in World War II.

Design

Right elevation and deck plan as depicted in Brassey's Naval Annual 1923

The Danaes were based on the design of the preceding C class series, but were lengthened by 20 feet (6 m) to allow a sixth 6-inch (152 mm) gun to be worked in between the bridge and the forefunnel. This gave an 'A', 'B', 'P', 'Q', 'X', 'Y' arrangement. Additionally, the twin torpedo tubes in the C class were replaced by triples, giving the Danaes a total of twelve tubes, the heaviest torpedo armament for a cruiser at the time. Machinery and general layout was otherwise the same as the Ceres group of C-class cruisers. However, Danae, Dauntless and Dragon were ordered before the Capetown group, and therefore did not incorporate the improved bow design of the latter; the C class were very wet forwards, and in the Capetowns sheer was increased forwards into a knuckled "trawler bow". Such was the success of the knuckled bow that it was incorporated into all subsequent British cruisers (except Birmingham of 1935 which was completed without). Despatch and Diomede had their beam increased by ½ foot to increase stability and Dragon and Dauntless were completed with a hangar for a floatplane built into the bridge, the compass platform being on top. Delhi, Dunedin, Durban, Despatch and Diomede were provided with flying-off platforms for a wheeled aircraft aft. Despatch and Diomede were completed with 4 inch anti-aircraft (A/A) guns vis 12 pounder (3 inch) guns in their sisters and Diomede had 'A' gun shipped in a weatherproof housing CP Mark XVI, an encouraging development for gun crews hitherto exposed to the worst of the elements on the fo'c'sle.

Modifications

ORP Dragon, previously HMS Dragon

The lessons of the Battle of Jutland were applied and protection was improved in detail. Additional torpedo tubes were installed and depth charge throwers were also included. The Mk XII 6-inch (152 mm) gun was retained but, in Diomede, a new prototype gun house (allowing greater elevation) was used and found to be most satisfactory.

Inter-war, all ships had their anti-aircraft armament standardised as three QF 4 inch Mark V guns on mountings HA Mark III, with a QF 2 pdr Mk.II gun in each bridge wing. All aircraft equipment were removed and Dragon and Dauntless had their bridges rebuilt along the lines of the rest of the class.

Early modifications in World War II included the addition of Radar Type 286 air warning at the foremast head and, later, Type 273 centimetric target indication set on the searchlight platform amidships. Between 6 and 8 20 mm Oerlikon guns were generally added, replacing the old 2 pounder guns in the bridge wings, on either side of 'P' and 'Q' guns and on the quarterdeck. In 1942, Dauntless (and in 1943, Danae) had the aft 4 inch A/A gun replaced by a quadruple mounting Mark VII for the 2 pounder Mark VIII gun and in 1943, Danae and Dragon had 'P' gun and the forward pair of 4-inch (102 mm) guns replaced by two such mountings and their Radar Type 282 equipped directors. Dragon and Danae were taken in hand again in 1943 and had the aft 4 inch / 2 pounder mountings replaced by a twin Mounting Mark XIX for the QF 4 inch Mark XVI gun. Danae also received twin in lieu of single Oerlikon mounts and later received a pair of single Bofors 40 mm guns. Diomede landed her torpedo tubes in 1943 and received one twin mount "Hazemeyer" Mark IV and two single mounts Mark III for Bofors guns.

Durban, partially sunk as a breakwater

Between 1941 and 1942, Delhi was rebuilt in the United States as an anti-aircraft vessel. All armaments were removed, and five 5 inch L/38 Mark 12 guns in Mark 30 single mountings were added, controlled by a pair of Mark 37 Fire Control Systems. The guns were in all but the former 'P' position. She carried a new bridge and stepped light tripod masts fore and aft, carrying Type 291 air warning radar. A Type 273 target indication radar was added amidships and a Type 285 on the Mark 37 FCS for target ranging and bearings. The light armament consisted of two quadruple 2 pounder mounts Mark VII and their directors with Radar Type 282, a pair of twin Oerlikon mounts Mark V in the bridge wings and six single Mark III Oerlikon pedestal mounts.

Dragon and Durban were expended as breakwaters in support of the Normandy landings in June 1944, Dragon being replaced in Polish service by the Danae (as ORP Conrad) and Despatch was disarmed as a depot ship.

Ships

Three ships were ordered in September 1916 under the War Emergency Programme:

Construction data

Ship name	Pennant no.	Builder	Ordered	Laid down	Launched	Completed	Fate
Danae	D44	Sir W. G. Armstrong Whitworth and Company, High Walker	September 1916	11 December 1916	26 January 1918	18 July 1918	Transferred to the Polish Navy as ORP Conrad, 4 October 1944 – 28 September 1946; sold for breaking up, 22 January 1948
Dauntless	D45	Palmers Shipbuilding and Iron Company, Jarrow		3 January 1917	10 April 1918	2 December 1918	sold for breaking up, 13 February 1946
Dragon	D46	Scotts Shipbuilding and Engineering Company, Greenock		24 January 1917	29 December 1917	16 August 1918	Transferred to Polish Navy, 15 January 1943; damaged by German Neger manned torpedo off Caen, 8 July 1944; written off and expended as breakwater off Normandy beaches, 20 July 1944
Delhi	D47	Armstrong Whitworth	July 1917	29 October 1917	23 August 1918	7 June 1919	sold for breaking up, 22 January 1948
Dunedin	D93	Armstrong Whitworth		5 November 1917	19 November 1918	October 1919 by Devonport Royal Dockyard	Transferred to Royal New Zealand Navy, 1925; torpedoed and sunk by the German submarine U-124 off Saint Paul's Rock in the South Atlantic, 24 November 1941
Durban	D99	Scotts		22 June 1918	29 May 1919	1 September 1921 by Devonport Royal Dockyard	expended as breakwater off Normandy beaches, 9 June 1944
Despatch	D30	Fairfield Shipbuilding and Engineering Company, Govan	March 1918	8 July 1918	24 September 1919	2 June 1922 by Chatham Royal Dockyard	sold for breaking up, 5 April 1946
Diomede	D92	Vickers Limited, Barrow-in-Furness		3 June 1918	29 April 1919	24 February 1922 by Portsmouth Royal Dockyard	Transferred to Royal New Zealand Navy, 1925; sold for breaking up, 5 April 1946
Daedalus	—	Armstrong Whitworth		—	—	—	cancelled 26 November 1918
Daring		William Beardmore and Company, Dalmuir
Desperate		R. & W. Hawthorn Leslie and Company, Hebburn on Tyne
Dryad		Vickers

References

• Campbell, N.J.M. (1980). "Great Britain". In Chesneau, Roger (ed.). Conway's All the World's Fighting Ships 1922–1946. New York: Mayflower Books. pp. 2–85. ISBN 0-8317-0303-2.
• 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.
• Friedman, Norman (2010). British Cruisers: Two World Wars and After. Barnsley, UK: Seaforth Publishing. ISBN 978-1-59114-078-8.
• Friedman, Norman (2011). Naval Weapons of World War One: Guns, Torpedoes, Mines and ASW Weapons of All Nations; An Illustrated Directory. Barnsley, UK: Seaforth Publishing. ISBN 978-1-84832-100-7.
• Lenton, H. T. (1998). British & Empire Warships of the Second World War. Annapolis, Maryland: Naval Institute Press. ISBN 1-55750-048-7.
• Preston, Antony (1985). "Great Britain and Empire Forces". In Gray, Randal (ed.). Conway's All the World's Fighting Ships 1906–1921. Annapolis, Maryland: Naval Institute Press. pp. 1–104. ISBN 0-85177-245-5.
• Raven, Alan & Roberts, John (1980). British Cruisers of World War Two. Annapolis, Maryland: Naval Institute Press. ISBN 0-87021-922-7.
• Rohwer, Jürgen (2005). Chronology of the War at Sea 1939–1945: The Naval History of World War Two (Third Revised ed.). Annapolis, Maryland: Naval Institute Press. ISBN 1-59114-119-2.
• Whitley, M. J. (1995). Cruisers of World War Two: An International Encyclopedia. London: Cassell. ISBN 1-86019-874-0.

External links

• Ships of the Danae class