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Blackburn Skua

The Blackburn B-24 Skua was a carrier-based low-wing, two-seater, single-radial engine aircraft by the British aviation company Blackburn Aircraft. It was the first Royal Navy carrier-borne all-metal cantilever monoplane aircraft, as well as the first dive bomber in Fleet Air Arm (FAA) service. The aircraft took its name from the sea bird which 'divebombs' any potential predators that come too close to its nest.

Development
The origins of the Skua can be traced back to the Air Ministry's issuing of Specification O.27/34, which sought a naval dive bomber whose primary role would be to disable or destroy enemy aircraft carriers with a secondary role as a fighter. Blackburn chose to produce its own response under the internal design reference B-24, the design effort was headed by the aeronautical engineer G. E. Petty. Many competing companies also responded, including Avro, Boulton Paul, Hawker and Vickers. Both prototypes were powered by the Bristol Mercury XII radial engine; however, production Skuas were instead powered by the Bristol Perseus XII, largely due to the Mercury engine being prioritised for Bristol Blenheim production. Another change made on production aircraft was the elimination of the wing tip slots, as they were deemed unnecessary after handling tests revealed mild stall characteristics. Due to the growing urgency for more combat aircraft in the runup to the Second World War, an initial production contract for 190 Skuas was issued in July 1935, effectively being ordered straight from the drawing board. To accelerate production, it was decided to produce the mainplanes at the Olympia Works in Leeds, while a subcontracting arrangement with General Aircraft Limited saw this company build additional fuselages at its Hanworth facility. On 28 August 1938, the first production Skua Mk.II, L2867, performed its first flight at Brough, piloted by H. J. Wilson. Almost all of the production run was completed and delivered prior to the end of 1939, 26 Skuas were delivered during the month of July alone. However, due to delays in the overall programme, the Admiralty had also ordered the Fairey Fulmar to perform the same role. ==Design==
Design
. This aircraft also served with 801 Squadron in the Norwegian Campaign, and, flying from RAF Detling, was present at Dunkirk. The Blackburn Skua was configured as a low-wing cantilever monoplane of all-metal construction. Recesses in the lower surface of the wing accommodated modified Zap flaps that were used to shorten takeoff runs, steepen glides, and limit the aircraft's speed during steep dives. Balanced ailerons were fitted, which used inset hinges with mass balance assistance. Considerable design complexity was incurred by the choice to have both a retractable undercarriage and folding wings; the solution drew on the earlier Blackburn Airedale monoplane. Controllable trim tabs and a horn-balanced rudder were fitted, to ensure rapid spin recovery, a portion of the tailplane and the entirety of the fabric-covered elevator was positioned behind the trailing edge of the rudder. It was the Fleet Air Arm's first service monoplane and was a radical departure for a force that was primarily equipped with open-cockpit biplanes such as the Fairey Swordfish. and the Gloster Sea Gladiator's . However the Skua in the fighter role was never intended or envisaged to take on land-based fighters such as the Messerschmitt Bf 109. The Royal Navy and RAF (who at the time its specification was drawn up operated aircraft carrier air wings) only intended the aircraft to take on enemy reconnaissance and bomber aircraft. The Skua was, however, an effective dive bomber, which was arguably its main intended role. It scored numerous successes as a dive bomber in the Norwegian campaign, sinking and damaging a number of ships, most notably the German cruiser Königsberg on 10 April 1940. Royal Navy test pilot Captain Eric 'Winkle' Brown stated: ==Operational history==
Operational history
lined up on the flight deck of Ark Royal During late 1938, initial deliveries of the Skua commenced; the first unit to receive it was 800 Naval Air Squadron at Worthy Down, supplementing and eventually replacing their Hawker Nimrod and Hawker Osprey biplanes. By November, the squadron had embarked on and, during 1939, was followed by both 801 and 803 Squadrons. By the start of the Second World War, there were 33 operational Skuas; the type quickly proved itself in combat. On 14 September, three Skuas took off from Ark Royal to go to the aid of the which had been attacked by a U-boat. When they arrived, the Fanad Head was being shelled by the and all three dived to attack the submarine, which quickly dived to safety. Two of the Skuas were damaged by the blast of their 112 lb A/S bombs and had to ditch. This was due to that the bombs had been incorrectly fused with too brief a time lapse. As a result of this error the weapons detonated almost instantaneously, thus badly damaging the Skuas. U-30 returned to Germany with the crews of the two ditched Skuas, who became the first naval airmen to be prisoners of war in the conflict. . One of 16 Skuas from RNAS Hatston to attack and sink the in Bergen on 10 April 1940. This aircraft spun on the return flight and crashed, the only aircraft lost on that day. Skuas were originally credited with the first confirmed kill by British aircraft during the Second World War; on 26 September 1939, three Skuas of 803 Naval Air Squadron, flying from Ark Royal, shot down a Dornier Do 18 flying boat over the North Sea. (An earlier victory by a Fairey Battle on 20 September 1939 over Aachen, was later confirmed by French sources). On 10 April 1940, 16 Skuas of 800 and 803 NAS led by Lieutenant Commander William Lucy, flying from RNAS Hatston in the Orkney Islands made a 330 mile night flight to arrive at the very limit of their radius - at dawn over Bergen Harbour. They attacked and sank Königsberg with several direct hits. Jackson wrote of the sinking as being the high point of the Skua's career as a dive-bomber. On 26 and 27 April Skuas destroyed eight He 111 bombers and damaged several more whilst defending the fleet. During June 1940, Skuas of 801 Squadron flew from shore bases in Kent in support of the Dunkirk evacuation, acting as a unit of RAF Fighter Command. However, these Skuas were attacked on several occasions by RAF fighters who were unfamiliar with the aircraft and its paint scheme, with at least one aircraft being shot up by Spitfires and the gunner killed. It was to later crash land at Manston airfield. On 13 June 1940, two mostly-Skua squadrons suffered heavy losses during an attempt to bomb the at Trondheim; of 15 aircraft in the raid, eight were shot down and the crews killed or taken prisoner. Among the latter were both squadron commanders, Captain RT Partridge (RM) and Lieutenant Commander John Casson (RN). One bomb hit Scharnhorst; however, this did little damage. Despite its limitations, the Skua attained considerable success as a fighter against Axis bombers and flying boats over Norway, and to a lesser extent, in the Mediterranean in the early stages of the conflict. In action off Norway Skuas destroyed 28 Luftwaffe aircraft in air to air combat, including 17 He 111s and five Ju 88s; all kills being confirmed via Luftwaffe records. Lieutenant Commander William Lucy went on to become a fighter ace while flying his Skua. Later on the Skua was found to be too slow and under-powered to be an effective fleet defence fighter. Common Axis aircraft such as the Junkers Ju 88 and Savoia-Marchetti SM.79 were much faster than the Skua, making interception of these aircraft extremely difficult. The armament of four forward-firing .303 rifle caliber machine guns was becoming increasingly inadequate for this role and the type was withdrawn from front line service during 1941. Most Skuas were replaced by another two-seater, the Fulmar, which doubled the Skua's forward armament and had a speed advantage of . A number of aircraft were converted to target tugs, following withdrawal from front line service. Other Skuas were completed as target tugs from the factory and used by the RAF and Fleet Air Arm in this role (Fleet Requirements). The Blackburn Roc was a very similar aircraft developed as a turret fighter, with all its armament in a dorsal turret. The Roc was expected to fly with the Skua. Rocs were attached to Skua squadrons to protect the fleet anchorage at Scapa Flow in early 1940 and briefly from and Ark Royal during the Norwegian Campaign. Skuas and Rocs flew fighter sweeps and bombing sorties over the English Channel during Operation Dynamo and Operation Aerial, the evacuations of Allied forces from Dunkirk and other French ports. ==Variants==
Variants
;Skua Mk.I :Two prototypes. Powered by the Bristol Mercury, it had distinctive fairings to the engine cowling over the tappet valves of the Mercury. The first prototype, K5178, had a much shorter nose while K5179, the second prototype, had a lengthened nose to improve longitudinal stability. ;Skua Mk.II :Production aircraft powered by the sleeve valve Bristol Perseus. Long nose as per K5179 but with a shorter, smooth cowling. Two-seat fighter and dive bomber for the Royal Navy; 190 built by Blackburn at Brough Aerodrome. ==Surviving aircraft==
Surviving aircraft
No intact Skuas survive. In April 2007 the only known fairly complete Blackburn Skua was discovered in Orkdalsfjorden in Norway at a depth of . Due to an engine failure, the Skua, flown by John Casson, leader of 803 Squadron, had to make an emergency water landing in the fjord. Both crew members survived and spent the next five years as prisoners of war. Despite efforts to raise the aircraft to the surface as gently as possible, the tail broke off. The engine had become detached in the ditching. The fuselage, cockpit and wings were salvaged. The Skua will be restored at Norway's aviation museum in Bodø. In 1974, L2940 was recovered from Breidalsvatnet lake, near Grotli in Skjåk Municipality in Norway. Captain R. T. Partridge (RM) shot down a Heinkel He 111 and then made an emergency landing on the ice-covered lake on 27 April 1940. Survivors from both aeroplanes independently made their way to a mountain lodge, where they encountered each other. This incident serves as the basis for the film Into the White. ==Operators and units==
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