Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. The Sopwith 1 1/2 Strutter was a British one or two-seat biplane multi-role aircraft of the First World War. It is significant as the first British-designed two seater tractor fighter, and the first British aircraft to enter service with a synchronised machine gun. It also saw widespread but rather undistinguished service with the French Aeronautique Militaire. In December 1914, the Sopwith Aviation Company designed a small, two seat biplane powered by an 80 hp (60 kW) Gnome rotary engine, which became known as the "Sigrist Bus" after Fred Sigrist, Sopwith's Works Manager. The Sigrist Bus first flew on 5 June 1915, and although it set a new British altitude record on the day of its first flight, only one was built, serving as a company runabout.

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