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In the year 1917 SPAD equipped two of its successful S.VII aircraft with new engines. The one aircraft was equipped with a Renault 12D engine and the other one with a Hispano-Suiza 8Bc with a power of 200 horsepower (149 kW). A 37-mm cannon was also added to the Vickers machine gun. The new fighter became the prototype of a new aircraft family and had its first flight on 5th July 1917. It was called S.XII by SPAD and 300 aircraft were produced.