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From Wikipedia, the free encyclopedia
  (Redirected from Malta class aircraft carrier)
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Class overview
Name: Malta
Operators:  Royal Navy
Preceded by: Audacious class
Succeeded by: Centaur class
Planned: 4
Cancelled: 4
General characteristics (Design X1)
Type: Aircraft carrier
Displacement: 46,890 long tons (47,640 t) (standard)
57,700 long tons (58,600 t) (deep load)
Length: 897 ft (273.4 m) (o/a)
850 ft (259.1 m) (waterline)
Beam: 115 ft 6 in (35.2 m)
Draught: 35 ft (10.7 m) (deep load)
Installed power: 200,000 shp (150,000 kW)
8 Admiralty 3-drum boilers
Propulsion: 4 shafts
4 geared steam turbines
Speed: 33.25 knots (61.58 km/h; 38.26 mph)
Range: 7,100 nmi (13,100 km; 8,200 mi) at 20 knots (37 km/h; 23 mph)
Complement: 3,500
Armament: 8 × twin QF 4.5-inch dual-purpose guns
8 × sextuple, 7 × single 40 mm Bofors anti-aircraft guns
Armour:
Aircraft carried: 80–108
Aviation facilities: 2 catapults

The Malta-class aircraft carrier was a British large aircraft carrier design of World War II. Four ships were ordered in 1943 for the Royal Navy, but changing tactical concepts, based on American experience in the Pacific War, caused repeated changes to the design, which was not completed before the end of the war. All four ships were cancelled in 1945 before they were laid down.

Background[edit]

In July 1942 the Royal Navy formed the Future Building Committee, chaired by the Deputy First Sea Lord, to examine the fleet's requirements for the rest of the war. Tasked with anticipating the Navy's readiness and requirements for January 1944, the committee realised that a major expansion of naval aviation was required, which meant that more aircraft carriers would be needed. Many factors combined to drive up the size of these new carriers, notably the increasing size and speed of aircraft and the desire to increase the numbers of aircraft aboard fleet carriers. Another important consideration was the change in carrier tactics from the earlier doctrine of more attacks with smaller numbers of aircraft to the use of large, single airstrikes.[1]

Sir Stanley V. Goodall, Director of Naval Construction (DNC), proposed a variety of designs, both open and closed hangar. On 8 October 1943, the Board of Admiralty selected a closed-hangar design with an armoured flight deck and five propeller shafts. Reports of American operations in the Pacific convinced the Board to reopen the issue because they demonstrated that the ability to fly off all of a carrier's aircraft in a single airstrike was vital. That required a well-ventilated, open-hangar design, which would reduce the time required to launch the aircraft by allowing them to begin the typical 15-minute engine warm-up while still in the hangar. On 15 May 1944, the Board reversed itself and ordered the DNC to produce an open-hangar design with deck-edge lifts. An unarmoured flight deck was agreed upon in June by the Controller of the Navy and the Fifth Sea Lord.

The new design, 900 feet (274.3 m) long at the waterline and known as Design X, was submitted to the Board on 10 August, although it was not approved. In October, concerns arose over the size of Design X in that it might have problems manoeuvering in constricted harbours, and the DNC was asked for two smaller designs: X1, 50 feet (15.2 m) shorter, and Y, 150 feet (45.7 m) shorter. Design Y was too short for efficient operations with the larger aircraft the committee anticipated, and the First Sea Lord selected X1. It was submitted to the Board on 12 April 1945 and fully worked out in anticipation of approval that never came. The Board minutes for 31 August noted that further consideration of the design had been postponed.[2]

Description[edit]

Had the X1 design received final approval, the Malta class would have been about the same size as the American Midway-class aircraft carriers at 897 feet (273.4 m) in long overall and 850 feet (259.1 m) at the waterline. The beam would have been 115 feet 6 inches (35.2 m) at the waterline and they would have had a draught of 35 feet (10.7 m) at deep load. The ships would have displaced 46,890 long tons (47,640 t) at standard load and 57,700 long tons (58,600 t) at deep load. Their metacentric heights were estimated to be 8.42 feet (2.6 m) at standard load and 12.8 feet (3.9 m) at deep load.[3] Their complement was expected to consist of 3,520 officers and enlisted men.[4]

The 888-foot (270.7 m) flight deck had a maximum width of 121 feet 9 inches (37.1 m). Because the unarmoured flight required an expansion joint about amidships, the Maltas' island could not be a single structure and was split into two, each section with its own funnel. This allowed turbulence around the islands to be reduced and provided more space for radars and fire-control directors.[5] The carriers would have been fitted with 16 arrestor cables that were designed to stop landing aircraft up to 20,000 pounds (9,100 kg) in weight, at speeds of up to 75 knots (139 km/h; 86 mph). They would have been backed up by three crash barricades to prevent landing aircraft from crashing into aircraft parked on the ship's bow. Positioned on the forward part of the flight deck, two newly designed hydraulic aircraft catapults were intended to launch fully laden aircraft at 130 knots (240 km/h; 150 mph).[Note 1] The ships were designed with four 30,000-pound (14,000 kg) lifts (two on the centreline (45 by 46 feet (13.7 by 14.0 m), and two on the portside deck edge (54 by 36 feet (16.5 by 11.0 m)) to facilitate the rapid movement of aircraft between the flight deck and the hangar. This was 440 feet (134.1 m) long, with a maximum width of 90 feet (27.4 m), and 17 feet 6 inches (5.3 m) high to accommodate American aircraft designed for that height. In case of fire the hangar was intended to be divided by four sliding steel doors.[7] Between the hangar spaces and the deck park, the Malta class would have been capable of accommodating between 80[3][4][8] and 108 aircraft.[9] For these aircraft, the ships would have been provided with 190,000 imperial gallons (860,000 l; 230,000 US gal) of aviation gasoline.[9]

Propulsion[edit]

The ships would have used four Parsons[9] double-reduction geared steam turbines,[10] each driving one shaft, using steam supplied by eight Admiralty 3-drum boilers.[8] The boilers were distributed between four boiler compartments, but all four turbines were in a single compartment, well aft.[6] The turbines were designed to produce a total of 200,000 shp (150,000 kW), enough to give them a maximum speed of 33.25 knots (61.58 km/h; 38.26 mph). The Malta class was designed to carry a maximum of 7,000 long tons (7,100 t) of fuel oil and diesel fuel (for the emergency generators); this was intended to give the ships a range of 7,100 nautical miles (13,100 km; 8,200 mi) at 20 knots (37 km/h; 23 mph) or 5,600 nautical miles (10,400 km; 6,400 mi) at 24 knots (44 km/h; 28 mph).[3]

Armament[edit]

The ships' main armament was intended to be sixteen quick-firing (QF) 4.5-inch (110 mm) dual-purpose guns in eight powered RP 41 Mk VII twin-gun turrets, four on each side of the hull.[9] The gun had a maximum range of 20,760 yards (18,980 m) at an elevation of +45° and a ceiling of 41,000 feet (12,000 m).[11] The light anti-aircraft (AA) armament would have consisted of 55 40 mm Bofors AA guns in eight sextuple stabilised, powered RP 50 Mk VI mounts and seven single mounts of an unknown type.[9] The Bofors gun had a maximum range of 10,750 yards (9,830 m) and a ceiling of 23,500 feet (7,200 m).[12]

Electronics[edit]

An August 1944 study anticipated that the ships would carry four early warning radars, including height-finders, four surface search radars and eight gunnery/fire-control radars.[13] Historian David Hobbs wrote that they would mount Type 960 early warning, Type 982 intercept, Type 983 height-finding and Type 293M target indication radars. In addition a number of gunnery radars would also be needed.[14]

Protection[edit]

The four inches (102 mm) hangar-deck armour of Design X1 was a reduction from the six-inch (152 mm) called for in the original X configuration. The waterline armour belt was also four inches thick, but only covered the central portion of the ship to form the armoured citadel. The belt was closed by three-inch (76 mm) transverse bulkheads fore and aft. One and a half inches (38 mm) of armour extended 40 feet (12.2 m) forward and 60 feet (18.3 m) aft of the belt to protect the waterline against splinter damage.

The underwater defense system was a layered system of liquid- and air-filled compartments, backed by an inclined holding bulkhead that was four inches thick at the top and tapered to a thickness of two inches (51 mm) at the bottom,[15] and was estimated to resist a 1,200-pound (540 kg) explosive charge. An earlier version, however, had been estimated to be able to resist a 2,000-pound (910 kg) charge, but failed against a 1,000-pound (450 kg) charge in a full-scale test.[16]

The magazines for the 4.5-inch guns and the steering gear both lay outside the armoured citadel and had their own armour. The magazines had four-inch roofs and sides, with three-inch ends while the steering gear also had a four-inch roof, but only three-inch sides and ends.[3]

Ordering and cancellation[edit]

Well before the design was finalised, four ships were ordered in July 1943. Africa was originally ordered as an unnamed Audacious-class carrier, but the order was modified to a Malta-class ship on 12 July 1943. Malta, New Zealand and Gibraltar were all ordered three days later. New Zealand was originally ordered from Cammell Laird, but the contract was transferred to Harland and Wolff on 22 July 1944. The Admiralty ordered Vickers not to order any more material on 27 April 1944 and given that final drawings were never issued to the builders, it is unlikely that any of them actually did more than preliminary work. None of the ships were ever laid down and all of them were cancelled before the end of 1945.[9]

Ships[edit]

Name Assigned builder[9] Yard number[9] Cancelled[9]
HMS Africa Fairfield Shipbuilding and Engineering Co., Govan, Scotland 722 15 October 1945
HMS Gibraltar Vickers-Armstrong, Newcastle-upon-Tyne 82
HMS Malta John Brown & Co., Clydebank 624 13 December 1945
HMS New Zealand Cammell Laird, Birkenhead
then Harland and Wolff, Belfast, Northern Ireland
1159
then 1304

Notes[edit]

  1. ^ The best hydraulic catapult that the British actually built, the BH5, could only reach a speed of 75 knots.[6]

Footnotes[edit]

  1. ^ Friedman, pp. 268, 270–72
  2. ^ Friedman, pp. 272, 291–92, 294–95
  3. ^ a b c d Friedman, p. 295
  4. ^ a b Chesneau 1995, p. 140
  5. ^ Friedman, pp. 290, 292, 295
  6. ^ a b Hobbs, p. 214
  7. ^ Hobbs, pp. 214–15
  8. ^ a b Chesneau 1980, p. 21
  9. ^ a b c d e f g h i Hobbs, p. 215
  10. ^ Friedman, p. 294
  11. ^ Campbell, pp. 52, 55
  12. ^ Campbell, p. 67
  13. ^ Friedman, p. 291, note 10
  14. ^ Hobbs, p. 213
  15. ^ Friedman, p. 296
  16. ^ Brown, p. 54

References[edit]

  • Brown, David K. (2006). Nelson to Vanguard: Warship Design and Development 1923–1945. London: Chatham Publishing. ISBN 1-59114-602-X. 
  • Campbell, John (1985). Naval Weapons of World War II. Annapolis, Maryland: Naval Institute Press. ISBN 0-87021-459-4. 
  • Chesneau, Roger (1995). Aircraft Carriers of the World, 1914 to the Present: An Illustrated Encyclopedia (New, Revised ed.). Annapolis, Maryland: Naval Institute Press. ISBN 0-87021-902-2. 
  • Chesneau, Roger, ed. (1980). Conway's All the World's Fighting Ships 1922–1946. Greenwich, UK: Conway Maritime Press. ISBN 0-85177-146-7. 
  • Friedman, Norman (1988). British Carrier Aviation: The Evolution of the Ships and Their Aircraft. Annapolis, Maryland: Naval Institute Press. ISBN 0-87021-054-8. 
  • Hobbs, David (2013). British Aircraft Carriers: Design, Development and Service Histories. Barnsley, UK: Seaforth Publishing. ISBN 978-1-84832-138-0. 

External links[edit]

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