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The Eagle was the first production Rolls-Royce aircraft engine to be used in service during World War I. Resulting from a 1914 British Admiralty requirement for an engine of about 186 kw (250 hp), development began in 1915. The first experimental engine was run in February 1915, developing 168 kw (225 hp). A total of 4,681 Eagles were manufactured at the Rolls-Royce Derby facility; 3,302 of the Eagle VIII models were built between 1917 and 1922. The Eagle VIII powered a many British aircraft including: Airco D.H.4/4A and D.H.9A srs; ANEC III; B.A.T.F.K.26; Blackburn Blackbird; Curtiss H.12/H.16 Large America; de Havilland D.H.10C Amiens II/IIIC and D.H.16; Fairey F.17 Campania and IIIC/IIID; Felixstowe F.2A, F.3, and F.5; Handley Page H.P.12 O/400, H.P.15 V/1500, and H.P.18 W.8b; Royal Aircraft Factory F.E.2d; Short N.1B/N.2B Shirl; Sopwith Atlantic and Wallaby; Supermarine Commercial Amphibian and Sea Eagle; Vickers F.B.27 Vimy IV and 66 Vimy Commercial.