Rolls-Royce Griffon with another two powered by the Bristol Centaurus XXII and the final prototype would have the Bristol Centaurus XII engine. It was the Hawker Fury prototype that would be the first

and both prototypes would be powered by the 840-hp Bristol Mercury IX engine, with the 9th February 1937 seeing the maiden flight of the first prototype. Prior to this 190 aircraft had been ordered in

The Bristol Hercules VI was to power two with the Rolls-Royce Merlin XX powering the other two, in the end the Merlin XX would be fitted to all four aircraft. Flying from Ringway the prototype made

as the original Bristol Olympus engines which were to be fitted weren't ready yet. Although the following year these were replaced by the 7,500lb thrust Armstrong Siddeley Sapphire A.5.5a 65 engines.

the aircraft was powered by the 690-hp Bristol Pegasus IIIM3 engine. This gave the Swordfish Mk I a top speed of 139 mph, range of 546 miles with a service ceiling of 10,700 ft. Armament consisted of

Powered by four 1,375-hp Bristol Hercules II engines, and with John Lankester Parker the pilot, and now called the Stirling, the prototype flew for the first time on the 14th May 1939. However, on landing

With the Air Ministry looking to replace the Bristol Bulldog fighter, Specification F.20/27 was issued for which Gloster submitted their 450-hp Bristol Mercury powered SS.18 design and this made its maiden

aircraft also served as test-beds including with the Bristol Aeroplane Company who would use a number of airframes to test engines. These included the engine intended to power the Fairy Albacore, the

Air Ministry were looking for a replacement for the Bristol Bulldog, despite already ordering the Gloster Gauntlet, and this lead to Specification F.7/30 being issued on the 1st October 1931. This called

which was powered by the 890-hp Bristol Mercury XII engine, had a top speed of 219 mph, range of 600 miles with a service ceiling of 26,000 ft. Armament was four 0.303-in machine-guns and 500lb bombs.