The Bristol Hercules VI engine was to power two, with the Rolls-Royce Merlin XX engine powering the other two. In the end the Rolls-Royce Merlin XX engine would be fitted to all four aircraft. The York

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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.

still in development, the Bristol Bulldog, which had a top speed of 174 mph. The Hart would then be sent to the Aeroplane and Armament Experimental Establishment to undergo testing on the 8th September

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

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

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increase in wingspan and would be powered by the 1,650-hp Bristol Hercules XVI engine. This gave the aircraft a top speed of 282 mph, range of 1,860 miles with a service ceiling of 24,000 ft. Armament

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

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