Hawker Hurricane

The Hawker Hurricane is a British single-seat fighter aircraft of the 1930s–40s that was designed and predominantly built by Hawker Aircraft Ltd for service with the RAF.

The Hurricane inflicted 60 percent of the losses sustained by the Luftwaffe in the Battle of Britain, and fought in all the major theatres of the Second World War.

Variants

Hurricane Mk I

First production version, with fabric-covered wings, a wooden two-bladed, fixed-pitch propeller (first 435) or three blade two -pitch propeller, powered by the 1,030 hp (770 kW) Rolls-Royce Merlin Mk II (first 364) or III engines and armed with eight .303 in (7.7 mm) Browning machine guns.

Produced between 1937 and 1939.

Hurricane Mk I (revised)

A revised Hurricane Mk I series built with a de Havilland or Rotol constant speed metal propeller (from mid 1940), metal-covered wings, armour and other improvements.

A total of 4,200 mark I were built, 1,924 by Hawker, 1,850 by Gloster Aircraft Company and 426 by Canadian Car and Foundry between December 1937 and July 1941.

The Canadian Car and Foundry Hurricanes were shipped to England to be fitted with engines.

Hurricane Mk IIA Series 1

Hurricane Mk I powered by the improved Merlin XX engine with two-speed supercharger.

This new engine used a coolant mix of 30 per cent glycol and 70 per cent water.

Pure glycol is flammable, so not only was the new mix safer, but the engine also ran approximately 21 °C (70 °F) cooler, which gave longer engine life and greater reliability.

The new engine was longer than the earlier Merlin and so the Hurricane gained a 4.5 in “plug” in front of the cockpit, which made the aircraft slightly more stable due to the slight forward shift in centre of gravity.

First flew on 11 June 1940 and went into squadron service in September 1940.

Hurricane Mk IIB

(Hurricane IIA Series 2)

A few were fitted with racks allowing them to carry two 250 lb (110 kg) or two 500 lb (230 kg) bombs.

This lowered the top speed of the Hurricane to 301 mph (484 km/h), but by this point mixed sweeps of Hurricanes carrying bombs, protected by a screen of fighter Hurricanes were not uncommon.

The same racks allowed the Hurricane to carry two 45 imp gal (200 l) drop tanks instead of the bombs, nearly doubling the Hurricane’s fuel load.[148]

Hurricane Mk IIA Series 2 was equipped with a new and slightly longer propeller spinner, and 4 additional wing-mounted .303 in (7.7 mm) Browning machine guns; for a total of 12 guns.

The first aircraft were built in February 1941 and were renamed Mark IIB in April 1941.

Hurricane Mk IIB Trop

For use in North Africa the Hawker Hurricane Mk IIB (and other variants) were tropicalised.

They were fitted with Vokes and Rolls-Royce engine dust filters and the pilots were issued with a desert survival kit, including a bottle of water behind the cockpit.

Hurricane Mk IIC

(Hurricane Mk IIA Series 2)

Hurricane Mk IIA Series 1 equipped with new and slightly longer propeller spinner, and fully replaced the machine-gun armament with four 20 mm (0.79 in) Hispano Mk II cannons, two per side.

Hurricane IIA Series 2 became the Mk IIC in June 1941, using a slightly modified wing.

The new wings also included a hard point for a 500 or 250 lb (230 or 110 kg) bomb and, later in 1941, fuel tanks.

By then performance was inferior to the latest German fighters, and the Hurricane changed to the ground-attack role, sometimes referred to as the Hurribomber.

The mark also served as a night fighter and intruder with about three quarters converted to fighter bombers.

Hurricane Mk IID

Armed with two 40 mm (1.57 in) anti-tank auto cannon in a gondola-style pod, one under each wing and a single Browning machine gun in each wing loaded with tracers for aiming purposes.

The first aircraft flew on 18 September 1941 and deliveries started in 1942.

Serial-built aircraft had additional armour for the pilot, radiator and engine, and were armed with a Rolls-Royce gun with 12 rounds, later changed to the 40 mm (1.57 in) Vickers S gun with 15 rounds.

The outer wing attachments were strengthened so that 4G could be pulled at a weight of 8,540 lb (3,870 kg).

The weight of guns and armour protection marginally impaired the aircraft’s performance.

Hurricane Mk IIE

Mk IIE, this designation was used by the Ministry of Aircraft Production in 1942 and 1943 for mark II factory fitted with wing racks, the RAF used the IIB or C designation.

The Mk IIE was not an early mark Mk IV.

Hurricane Mk T.IIC

Two-seat training version of the Mk. IIC – Only two aircraft were built, for the Imperial Iranian Air Force.

Hurricane Mk III

Version of the Hurricane Mk II powered by a US Packard-built Merlin engine, intending to enable supplies of the British-built engines for other designs.

By the time production was to have started, British Merlin production had increased to the point where the idea was abandoned.

Hurricane Mk IV

The last major change to the Hurricane was the introduction of the “universal Wing”, a single design able to mount two 250 or 500 lb (110 or 230 kg) bombs, two 40 mm (1.57 in) Vickers S guns, drop tanks or eight “60 pounder” RP-3 rockets.

Two .303 in (7.7 mm) Brownings were fitted to aid aiming of the heavier armament.

Despite persistent reports actually fitted with the same Merlin XX as the mark II.

All Merlin 27 were modified to Merlin 25 and used in Mosquitoes, there were only 16 production Merlin 24 by the time over 300 mark IV had been delivered.

The individual aircraft cards held by the RAF museum reports the final mark IV had Merlin XX.

The radiator was deeper and armoured.

Additional armour was also fitted around the engine.

524 built by Hawker between December 1942 and March 1944.

Hurricane Mk V

The final variant to be produced – Only one was built and 2 mark IV converted, and the variant never reached production.

This was planned to be powered by a Merlin 27 but also tested with a Merlin 32 boosted engine to give 1,700 hp (1,300 kW) at low level and was intended as a dedicated ground-attack aircraft to use in Burma.

All three prototypes had four-bladed propellers.

Speed was 326 mph (525 km/h) at 500 ft (150 m), which is comparable with the Hurricane I despite being one and a half times as heavy.

Hurricane Mk X

Canadian-built variant – Canadian Car and Foundry report building a total of 975 mark II airframes for Holland (1), the RAF (575) and RCAF (400), between July 1941 and May 1943.

The mark X designation has been used by the RAF for Canadian Car and Foundry built mark I but it is usually defined as mark II airframes fitted with a Merlin 28.

About two thirds of the Canadian Car and Foundry built mark II airframes shipped to Britain did so without an engine, the remainder being fitted with Merlin 28 in Canada, but the engine was near automatically removed upon arrival and a Merlin XX fitted instead and the aircraft called mark II by the RAF.

Apart from some test flights in Canada and England no Hurricane flew powered by a Merlin 28.

Canada only imported 285 Merlin 28 for Hurricanes, all of which were shipped to Britain either as a separate engine or attached to a Hurricane.

Hurricane Mk XI

Canadian-built variant – Designation used for 150 aircraft from the RCAF mark XII order sent to Britain, these aircraft had their Merlin 29 removed and were either shipped without an engine or fitted with a Merlin 28.

Fitted with Merlin XX on arrival in Britain and called mark II by the RAF.

Hurricane Mk XII

Canadian-built variant,

Single-seat fighter and fighter-bomber.

Powered by a 1,300 hp (970 kW) Packard Merlin 29.

Initially armed with 12 0.303 in (7.7 mm) machine guns, but this was later changed to four 20 mm (0.79 in) cannon.

Hurricane Mk XIIA

Canadian-built variant

Single seat fighter/fighter bomber

An order for 400 mark II airframes for the RCAF powered by a 1,300 hp (970 kW) Packard Merlin 29, armed with eight 0.303 in (7.7 mm) machine guns, production starting in June 1942.

150 sent to Britain in 1943 either engineless or fitted with a Merlin 28.

Also a batch of 30 RAF order mark II airframes retained in Canada in late 1941 and initially fitted with Merlin III became mark XII when later fitted with Merlin 29.

Holland standard Hurricane.

Canadian built variant.

RAF serial airframe AM270 was completed around early March 1942 to Dutch standards, including US built Merlin, instruments and gun sight, as the prototype of an order for the Netherlands East Indies (KM/KNIL). Given the Dutch serial HC3-287, its subsequent fate is unclear beyond being used by Canadian Car and Foundry for test flying.

Sea Hurricane Mk IA

The Sea Hurricane Mk IA was a Hurricane Mk I modified by General Aircraft Limited.

These conversions numbered approximately 250 aircraft.

They were modified to be carried by CAM ships (catapult-armed merchantman), whose ships’ crews were Merchant Marine and whose Hurricanes were crewed and serviced by RAF personnel, or Fighter Catapult Ships, which were Naval Auxiliary Vessels crewed by naval personnel and aircraft operated by the Fleet Air Arm.

These ships were equipped with a catapult for launching an aircraft, but without facilities to recover them.

Consequently, if the aircraft were not in range of a land base, pilots had to bail out or to ditch.

Both of these options had their problems, there was always a chance of striking part of the fuselage when bailing out, and a number of pilots had been killed in this way.

Ditching the Hurricane in the sea called for skill as the radiator housing acted as a water brake, pitching the nose of the fighter downwards when it hit the water, while also acting as a very efficient scoop, helping to flood the Hurricane so that a quick exit was necessary before the aircraft sank.

Then the pilot had to be picked up by a ship.

More than 80 modifications were needed to convert a Hurricane into a Sea Hurricane, including new radios to conform with those used by the Fleet Air Arm and new instrumentation to read in knots rather than miles per hour.

The majority of the aircraft modified had suffered wear-and-tear serving with front line squadrons, so much so that at least one example used during trials broke up under the stress of a catapult launching.

CAM Sea Hurricanes were launched operationally on eight occasions and the Hurricanes shot down six enemy aircraft for the loss of one Hurricane pilot killed.

Sea Hurricane Mk IB

Hurricane Mk I version equipped with catapult spools plus an arrester hook.

From July 1941 they operated from HMS Furious and from October 1941, they were used on merchant aircraft carrier (MAC) ships, which were large cargo vessels with a flight deck fitted, enabling aircraft to be launched and recovered.

Apart from the conversions in Britain 50 Sea Hurricane IB were built in Canada and delivered in late 1941 and early 1942.

Initially fitted with a Merlin III, they became Mk XIIA when later fitted with a Merlin 29.

Sea Hurricane Mk IC

Reported to be a Hurricane Mk I version equipped with catapult spools, an arrester hook and the four-cannon wing.

The Sea Hurricane I used during Operation Pedestal had their Merlin III engines modified to accept 16 psi (110 kPa) boost, and could generate more than 1,400 hp (1,000 kW) at low altitude.

Sea Hurricane Mk IIC

60 built by Hawker between November 1942 and May 1943, version equipped with naval radio gear; other standard mark IIC were converted and used on fleet carriers.

The Merlin XX engine on the Sea Hurricane generated 1,460 hp (1,090 kW) at 6,250 ft (1,900 m) and 1,435 hp (1,070 kW) at 11,000 ft (3,400 m).

Top speed was 322 mph (518 km/h) at 13,500 ft (4,100 m) and 342 mph (550 km/h) at 22,000 ft (6,700 m).

Note the RAF reports as of end June 1944 a total of 378 conversions to Sea Hurricane I, less any conversions back to standard Hurricanes, and no conversions to Sea Hurricane II

Sea Hurricane Mk XII

50 Canadian built Sea Hurricane I delivered in late 1941 and early 1942. Initially fitted with Merlin III as mark I, they became Mk XII when fitted with Merlin 29.

Hillson F.40 (a.k.a. F.H.40)

A full-scale version of the Hills & Son Bi-mono slip-wing Biplane/monoplane, using a Hawker Hurricane Mk I returned from Canada as RCAF ser no 321 (RAF serial L1884).

Taxi and flight trials carried out at RAF Sealand during May 1943, and at the Aeroplane and Armament Experimental Establishment, Boscombe Down from September 1943.

The upper wing was not released in flight before the program was terminated due to poor performance.

Hurricane Photo Reconnaissance

The Service Depot at Heliopolis in Egypt converted several Hurricanes Is for photo reconnaissance.

The first three were converted in January 1941.

Two carried a pair of F24 cameras with 8-inch focal length lenses.

The third carried one vertical and two oblique F24s with 14-inch focal length lenses mounted in the rear fuselage, close to the trailing edge of the wing, and a fairing was built up over the lenses aft of the radiator housing.

A further five Hurricanes were modified in March 1941, and two were converted in a similar manner in Malta during April 1941.

During October 1941 a batch of six Hurricane IIs was converted to PR Mark II status and a final batch, thought to be of 12 aircraft, was converted in late 1941.

The PR Mark II was said to be capable of slightly over 350 mph (560 km/h) and was able to reach 38,000 ft (12,000 m).

Hurricane Tac R

For duties closer to the front lines some Hurricanes were converted to Tactical Reconnaissance (Tac R) aircraft.

An additional radio was fitted for liaison with ground forces who were better placed to direct the Hurricane.

Some Hurricane Tac R aircraft also had a vertical camera fitted in the rear fuselage, so to compensate for the extra weight either one or two Brownings or two cannons would be omitted.

Externally these aircraft were only distinguishable by the missing armament.

Specifications

Crew

One

Length

32 ft 3 in (9.83 m)

Wingspan

40 ft 0 in (12.19 m)

Height

13 ft 1.5 in (4.001 m)

Wing area

257.5 sq ft (23.92 m2)

Airfoil

Root

Clark YH (19%)

Tip

Clark YH (12.2%)

Empty weight

5,745 lb (2,606 kg)

Gross weight

7,670 lb (3,479 kg)

Max take-off weight

8,710 lb (3,951 kg)

Powerplant

1 × Rolls-Royce Merlin XX V-12 liquid-cooled piston engine, 1,185 hp (884 kW) at 21,000 ft (6,400 m)

Propellers

3-bladed

Performance

Maximum speed

340 mph (550 km/h, 300 kn) at 21,000 ft (6,400 m)

Range

600 mi (970 km, 520 nmi)

Service ceiling

36,000 ft (11,000 m)

Rate of climb

2,780 ft/min (14.1 m/s)

Wing loading

29.8 lb/sq ft (145 kg/m2)

Power/mass

0.15 hp/lb (0.25 kW/kg)

Armament

Guns

4 × 20 mm (0.79 in) Hispano Mk II cannon

Bombs

2 × 250 or 500 lb (110 or 230 kg) bombs.

 

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