It was not accepted for further consideration; the most valued submissions being from Armstrong Whitworth and Fairey, however the F.155 requirement was dropped as a result of the 1957 Defence White Paper.
Design and development
The Type 559 was an unorthodox canard design with a massive chin air intake, split vertically, for two reheated de Havilland Gyron engines of 20,000 pounds-force (89 kN) thrust each, placed as in the English Electric Lightning, one above the other. Two de Havilland Spectre Junior rockets were situated each side of the fuselage at wing level. Two Red Hebe or Blue Jay missiles were mounted alongside the upper part of the fuselage between the canard and the mainplane, which had end-plates incorporating twin rudders.
Data from Supermarine Aircraft since 1914 
- Crew: 2 (pilot, weapons systems/navigation)
- Length: 68 ft 3 in (20.8 m)
- Wingspan: 42 ft (12.8 m)
- Height: 15 ft 3 in (4.65 m)
- Wing area: 615 ft² (57.1 m²)
- Empty weight: 41,485 lb (18,817 kg)
- Loaded weight: 62,190 lb (28,209 kg)
- 2 × de Havilland Gyron PS.26/1 turbojet, 20,000 lbf (89 kN) each
- 2 × De Havilland Spectre Junior kerosene/hydrogen peroxide rocket motor, 5,000 lbf (22 kN) each
- Maximum speed: 2.5 Mach
- Service ceiling: 60,000 ft (18,000 m) specified by F.155
- Endurance: 32 minutes
- Missiles: 2 × Red Hebe (radar guided) or Blue Jay (heat-seeking) missiles
- Buttler 1996, p.73.
- Andrews and Morgan 1987, p.309.
- Andrews, C.F. and E.B. Morgan. Supermarine Aircraft since 1914. London:Putnam, 1987. ISBN 0-85177-800-3.
- Butler, Tony. "Futile Rivals: F.155T - The Quest for "An Ultimate in Interceptors"". Air Enthusiast, No. 61, January/February 1996. Stamford, UK:Key Publishing. ISSN 0143 5450. pp. 65–73.
- Buttler, Tony. British Secret Projects: Jet Fighters Since 1950. Leicester, UK: Midland Publishing, 2000, ISBN 1-85780-095-8.
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