In 1916, Herbert Smith became Chief Engineer of the Sopwith company, and under his design leadership its other successful World War I types included the larger Type 9901. This aircraft, better known as the 1½ Strutter due to its unconventional cabane strut arrangement, was used from 1916 by the RNAS, RFC and the French "Aviation Militaire" as a single-seat bomber, two-seat fighter and artillery spotter and trainer. Soon after came the small and agile single-seat Scout, which quickly became better known as the Pup because of its obvious descent from the 1½ Strutter. The Pup and 1½ Strutter were the first successful British tractor fighters equipped with a synchronisation gear to allow a machine gun to fire through the rotating propeller. This gear was known as the Sopwith-Kauper gear from its designers, although several other designs were used later. The Pup was widely used on the Western Front by the RFC and from ships by the RNAS from the autumn of 1916 to the early summer of 1917, and was considered a delight to fly by its pilots. It continued in use as an advanced trainer for the remainder of the War. The Pup began the famous series of "animal"-named Sopwith aircraft during the war, which, as a whole, would become renowned in aviation history as "The Flying Zoo".