Powerplant: 2 × Bristol Taurus T-S(a) 14-cylinder air-cooled sleeve-valve radial piston engines, 1,000 hp (750 kW) each
Propellers: 3-bladed Rotol, 10 ft (3.0 m) diameter variable pitch metal propellers
Maximum speed: 360 mph (580 km/h, 310 kn) at 15,000 ft (4,572 m)
Service ceiling: 30,000 ft (9,100 m)
Rate of climb: 2,460 ft/min (12.5 m/s) at 16,000 ft (4,877 m)
Time to altitude: 28,000 ft (8,534 m) in 19 minutes 36 seconds
Wing loading: 30.1 lb/sq ft (147 kg/m2)
Power/mass: 0.172 lb/hp (0.105 kg/kW)
Four 0.303 in (7.7 mm) Browning machine guns
Two 20 mm Hispano cannon
provision for 20 lb (9.1 kg) bomb carriers
The Gloster F.9/37, also known as the Gloster G.39, was a British twin-engined design from the Gloster Aircraft Company for a cannon-armed heavy fighter to serve with the Royal Air Force, planned before the Second World War.
The F.9/37 was rejected in favour of other designs.