The Hawker Hurricane is a British single-seat fighter aircraft that was designed and predominantly built by Hawker Aircraft Ltd. Some production of the Hurricane was carried out in Canada by the Canada Car and Foundry Co Ltd. Although largely overshadowed by the Supermarine Spitfire, the aircraft became renowned during the Battle of Britain.

The 1930s design evolved through several versions and adaptations, resulting in a series of aircraft which acted as interceptor-fighters, fighter-bombers (also called "Hurribombers"), and ground support aircraft. Further versions known as the Sea Hurricane had modifications which enabled operation from ships. Some were converted as catapult-launched convoy escorts, known as "Hurricats". Together with the Spitfire, the Hurricane was significant in enabling the Royal Air Force (RAF) to win the Battle of Britain of 1940, accounting for the majority of the RAF's air victories. More than 14,500^.  Hurricanes were built by the end of 1944 (including about 1,200 converted to Sea Hurricanes and some 1,400 built in Canada), and served in all the major theatres of the Second World War.

The Hurricane was developed by Hawker in response to the Air Ministry specification F.36/34 (modified by F.5/34) for a fighter aircraft built around the new Rolls-Royce engine, then only known as the PV-12, later to become famous as the Merlin. At that time, RAF Fighter Command comprised just 13 squadrons, each equipped with either the Hawker Fury, Hawker Hart variant, or Bristol Bulldog – all biplanes with fixed-pitch wooden propellers and non-retractable undercarriages.The design, started in early 1934, was the work of Sydney Camm.

Sydney Camm's original plans submitted in response to the Air Ministry's specification were at first rejected (apparently "too orthodox," even for the Air Ministry). Camm tore up the proposal and set about designing a fighter as a Hawker private venture. With economy in mind, the Hurricane was designed using as many existing tools and jigs as possible (the aircraft was effectively a monoplane version of the successful Hawker Fury); and it was these factors that were major contributors to the aircraft's success.

Early design stages of the "Fury Monoplane" incorporated a Rolls-Royce Goshawk engine, but this was replaced shortly after by the Merlin, and featured a retractable undercarriage. The design came to be known as the "Interceptor Monoplane," and by May 1934, the plans had been completed in detail. To test the new design, a one-tenth scale model was made and sent to the National Physical Laboratory at Teddington. A series of wind tunnel tests confirmed the aerodynamic qualities of the design were in order, and by December that year, a full size wooden mock-up of the aircraft had been created.

Construction of the first prototype, K5083, began in August 1935 incorporating the PV-12 Merlin engine. The completed sections of the aircraft were taken to Brooklands, where Hawkers had an assembly shed, and re-assembled on 23 October 1935. Ground testing and taxi trials took place over the following two weeks, and on 6 November 1935, the prototype took to the air for the first time, at the hands of Hawker's chief test pilot, Flight Lieutenant (later Group Captain) P.W.S. Bulman. Flight Lieutenant Bulman was assisted by two other pilots in subsequent flight testing; Philip Lucas flew some of the experimental test flights, while John Hindmarsh conducted the firm's production flight trials.

Though faster and more advanced than the RAF's current front line biplane fighters, the Hurricane's design was already outdated when introduced. It employed traditional Hawker construction techniques from previous biplane aircraft, with mechanically fastened, rather than welded joints. It had a Warren girder-type fuselage of high-tensile steel tubes, over which sat frames and longerons that carried the doped linen covering.^[4] An advantage conferred by the steel-tube structure was that cannon shells could pass right through the wood and fabric covering without exploding. Even if one of the steel tubes were damaged the repair work required was relatively simple and could be done by the groundcrew at the airfield. An all metal structure, as with the Spitfire, damaged by an exploding cannon shell required more specialised equipment to repair. The old-fashioned structure also permitted the assembly of Hurricanes with relatively basic equipment under field conditions. Crated Hurricanes were assembled in West Africa and flown across the Sahara to the Middle East theatre, and to save space, some Royal Navy aircraft carriers carried their reserve Sea Hurricanes dismantled into their major assemblies, which were slung up on the hangar bulkheads and deckhead for reassembly when needed.

Initially, the wing structure consisted of two steel spars, and was also fabric-covered. Several fabric-wing Hurricanes were still in service during the Battle of Britain, although a good number had had their wings replaced during servicing or after repair. Changing the wings only required three hours' work per aircraft.^[6] An all-metal, stressed-skin wing of duraluminium (a DERD specification similar to AA2024) was introduced in April 1939 and was used for all of the later marks.^[2] "The metal skinned wings allowed a diving speed that was 80 mph [[130 km/h] higher than the fabric-covered ones. They were very different in construction but were interchangeable with the fabric-covered wings, and one trials Hurricane, L1877, was even flown with a fabric-covered port wing and metal-covered starboard wing. The great advantage of the metal-covered wings over the fabric ones was that the metal ones could carry far greater stress loads without needing so much structure beneath."

One of Camm's priorities with the new fighter was to provide the pilot with good all round visibility. To this end the cockpit was mounted reasonably high in the fuselage, creating a distinctive "hump-backed" silhouette. Pilot access to the cockpit was aided by a retractable "stirrup" mounted below the trailing edge of the port wing. This was linked to a spring-loaded hinged flap which covered a handhold on the fuselage, just behind the cockpit. When the flap was shut the footstep retracted into the fuselage. In addition, both wingroots were coated with strips of non-slip material.

In contrast, the contemporary Spitfire used all-metal monocoque construction and was thus both lighter and stronger, though less tolerant to bullet damage. With its ease of maintenance, widely set landing gear and benign flying characteristics, the Hurricane remained in use in theatres of operations where reliability, easy handling and a stable gun platform were more important than performance, typically in roles like ground attack. One of the design requirements of the original specification was that the Hurricane, as well as the Spitfire, was also to be used as a night-fighter. The Hurricane proved to be a relatively simple aircraft to fly at night and was to be instrumental in shooting down several German aircraft during the nocturnal hours. From early 1941 the Hurricane would also be used as an "intruder" aircraft, patrolling German airfields in France at night in an attempt to catch night bombers during takeoffs or landings.

The Hurricane was ordered into production in June 1936, mainly due to its relatively simple construction and ease of manufacture. As war was looking increasingly likely, and time was of the essence in providing the RAF with an effective fighter aircraft, it was unclear if the more advanced Spitfire would be able to enter production smoothly, while the Hurricane used well-understood manufacturing techniques. This was true for service squadrons as well, who were experienced in working on and repairing aircraft whose construction employed the same principles as the Hurricane, and the simplicity of its design enabled the improvisation of some remarkable repairs in Squadron workshops.

The maiden flight of the first production aircraft, powered by a Merlin II engine, took place on 12 October 1937. The first four aircraft to enter service with the RAF joined No. 111 Squadron RAF at RAF Northolt the following December. By the outbreak of the Second World War, nearly 500 Hurricanes had been produced, and had equipped 18 squadrons.

During 1940, Lord Beaverbrook, who was the Minister of Aircraft Production, established an organisation in which a number of manufacturers were seconded to repair and overhaul battle damaged Hurricanes. The "Civilian Repair Organisation". also overhauled battle-weary aircraft, which were later sent to training units or to other air forces; one of the factories involved was the Austin Aero Company's Cofton Hackett plant, which also built 300 Hurricanes. Another was David Rosenfield Ltd, based at Barton aerodrome near Manchester.

In all, some 14,000 Hurricanes and Sea Hurricanes were produced. The majority of Hurricanes were built by Hawker (which produced them until 1944), with Hawker's sister company, the Gloster Aircraft Company, making (2,750) most of the rest. As described, the Austin Aero Ltd built 300. Canada Car and Foundry in Fort William, Ontario, Canada, (where the Chief Engineer, Elsie MacGill, became known as the "Queen of the Hurricanes") was responsible for production of 1,400 Hurricanes, known as the Mk X.

In 1939, production of 100 Hurricanes was initiated in Yugoslavia by Zmaj and Rogozarski. Of these, 20 were built by Zmaj by April 1941. One of these was fitted with a DB 601 and test flown in 1941.

A contract for 80 Hurricanes was placed with Fairey's Belgian subsidiary Avions Fairey SA for the Belgian Air Force in 1938, it being intended to arm these aircraft with four 13.2 mm machine guns. Three were built and two flown with this armament by the time of the Blitzkrieg in May 1940, with at least 12 more built by Avions Fairey with the conventional eight rifle calibre machine gun armament.