Type 224 F.7/30 Fighter
In response to Air Ministry Specification F.7/30, Mitchell designed the Type 224 fighter. With cranked gull wing and fixed undercarriage it never lived up to the expectations conceived from early wind-tunnel tests and never went into production. None of the entries for the F.7/30 trials at Martlesham were accepted. Type 224 was flown to RAE Farnborough on 24th July, 1935 and eventually on to Orfordness where it was used a gunnery target.
Type: Single seat fighter
Engine: 600hp Roll-Royce Goshawk II
Max speed: 228mph at 15,000ft
Climb: 15,000ft in 9.5 minutes
Absolute ceiling: 38,000ft
Armament: Four .303 machine guns
Types 316-318 B.12/36 Bomber
Following issue of Specification B.12/36 Mitchell submitted his tender in September 1936 for a four engined bomber. The plane was a single-spar, mid-wing monoplane, with swept back leading and straight trailing edges. Bombs could be carried in the fuselage as well as in the wings, reducing the overall size of the planes fuselage. Three possible engines were proposed (see below). The plans were accepted by the Air Ministry but unfortuanely the two prototypes, along with the detailed plans, were destroyed by the bombing of the Supermarine Works, Woolston in September 1940.
Type: Six crew bomber
Engines: Four either 1,100hp Rolls-Royce Merlin, or 1,330hp Bristol Hercules, or 1,100 Napier Dagger
Max speed: Either 345mph at 14,500ft, or 360mph at 18,000ft, or 325mph at 17,000ft respectively
Service ceiling: Either 30,000ft, or 33,000ft, or 30,000ft respectively
Range: 3,000 miles
Armament: Front, rear and retractable mid turret.
Bomb-carrying capacity: 21,000lbs
NB As these types never flew the above specifications are estimates.