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In page Armstrong Whitworth Whitley:

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On 17 March 1936, the first prototype Whitley Mk I, K4586, conducted its maiden flight from Baginton Aerodrome, piloted by Armstrong Whitworth Chief Test Pilot Alan Campbell-Orde.[5] K4586 was powered by a pair of 795 hp (593 kW) Armstrong Siddeley Tiger IX 14-cylinder air-cooled aircraft radial engines. The second prototype, K4587, was furnished with a pair of more powerful medium-supercharged Tiger XI engines.[6][5] The prototypes differed little from the initial production standard aircraft; a total of 34 production Whitley Mk I were completed.[5]