Proposal based on Hurricane prototype with four Oerlikon 20mm guns. Tendered 23rd April 1936, but rejected. (Successful contender : Westland Whirlwind).

V7360 trials aircraft 3rd March, 1936.

Originated as trial installation of two Oerlikon 20mm guns under the wings for Service trials in 1939. Fought in the Battle Of Britain with 151 Sq., 1940.

L1750 trials aircraft during 1940.

DB601A installation undertaken in Yugoslavia, 1940-41. At least one completed in licence-built airframe before German invasion of April 1941.

One airframe allocated and part modified. Modified Blackburn Roc floats delivered to Kingston. Conceived during Norwegian campaign but abandoned in June 1940. Design max. speed 210 mph at 10,000 ft.

Simplified operational trainer project with Napier Dagger, studied during Battle Of Britain as a means of easing pressures on Merlin production. Discontinued November 1940.

One of several schemes during 1941 investigating alternative power plants for the Hurricanes in second-line duties to alleviate possible shortages of the Merlin.

One of several schemes submitted for the development of a four cannon Hurricane with a Rolls Royce Griffon IIA, 1939-41. Discontinued when the Typhoon entered production.

Hawker built Canadian aircraft modified in the UK with jettisonable auxiliary wing to assist short take off and also act as an extra fuel supply. Trials discontinued in January 1944.

L1884 trials aircraft shipped to Canada in 1939 (re-serialled 231 RCAF), afterwards returned to the UK

Several 12 gun Canadian Hurricane Mk. XIs modified with fixed ski main landing gear and snow shoe tail skid, wheel gear deleted and wheel wells faired over. Packard built Merlin and Hamilton Standard propeller. RCAF service in Canada 1941-43. 5624 (RCAF)

Proposed dedicated ground attack version for the far east. Ground boosted Merlin, four blade propeller, increased armour and universal wing. Three prototypes built in 1943. KX405 first Mk. IV first flight 14th March, 1942, (Lucas). This aircraft was retained by Hawker as a test airframe. Although its first flights were performed with a Merlin 32 and a Spitfire type Rotol 4 blade propeller, subsequent production aircraft featured the Merlin 24 or 27 with a 3 blade airscrew.

Reduced rear fuselage secondary structure. Intended to increase field of view for intruder operations. Prototype started but discontinued in March 1942. P3899 trials aircraft first flew on 26th October, 1940.

Two examples delivered. Original design started in 1939, completed 1945. First flown with both cockpits open but delivered with a Tempest hood over rear cockpit. P3270 flown by Reynell at Brooklands as 2-32 on 16th May, 1940, the other A/C was 2-31.