presented a brochure to the Air Ministry describing a "High-Performance Aeroplane for the Royal Navy", also known as the Supermarine Type 391. This design was intended to be used as a carrier-borne fighter, with a secondary role as a strike aircraft, able to carry an 18-inch (45.7 cm) Mark XV aerial torpedo. Bombs or rockets could also be carried and the fixed armament was four Hispano Mk. V 20mm cannon. The 391 used the Spiteful/Seafang wing and undercarriage mated to a wide centre-section incorporating leading edge air intakes feeding the coolant radiators for a 3,550 hp, 24 cylinder 46-H-24 (later known as the "Eagle"); this engine drove contra-rotating, four-bladed propellers. The fuselage was longer with a redesigned fin and rudder unit. Specifications for the Type 391 include a wingspan of 43 ft 6 in (13.3 m), a fuselage length of 39 ft 9 in (12.1 m) and a wing area of 335 ft² (31.2 m²). Maximum weights were 15,750 lb (7,144 kg) as a fighter and 17,250 lb (7,825 kg) when armed with a torpedo. The maximum speed was projected to be 546 mph (879 km/h) at 25,000 ft (7,620 m). Variants Type 382 Seafang F.31 Interim production variant with a 2,375 hp Griffon 61 engine, five-bladed constant-speed Rotol airscrew. 150 ordered but only 9 built; the rest were cancelled. Type 396 Seafang F.32 Two prototypes built powered by a 2,350 hp (1,752 kW) Griffon 89 piston engine, folding wings, increased fuel capacity, dual contra-rotating 3-bladed propellers. Operators Fleet Air Arm Specifications (Seafang 32) References Notes Bibliography Bingham, Victor. Supermarine Fighter Aircraft. Marlborough, UK: The Crowood Press, 2004. . Buttler, Tony. British Secret Projects: Fighters and Bombers 1935–1950. Hersham, Surrey, UK: Midland, 2004. . Humphreys, Robert. The Supermarine Spitfire, Part 2: Griffon-Powered (Modellers Datafile 5). Bedford, UK: SAM Publications, 2001. . Morgan, Eric B. and Edward Shacklady. Spitfire: The History. London: Key Publishing, 1992. . Price, Alfred. The Spitfire Story. London: Silverdale Books, 1995. . Price, Alfred. "A Spitfire too far: the Supermarine Spiteful". Aeroplane Monthly, July 2001, pp. 36–41. Robertson, Bruce. Spitfire: The Story of a Famous Fighter. Hemel Hempstead, Hertfordshire, UK: Model & Allied Publications Ltd., 1960. Third revised edition 1973. . Sturtivant, Ray. Fleet Air Arm Fixed-Wing Aircraft since 1946. Tonbridge, Kent, UK: Air Britain (Historians) Ltd., 2004. . 1940s British fighter aircraft Seafang Aircraft with contra-rotating propellers Carrier-based aircraft Aircraft first flown in 1946 Single-engined tractor