the majority of types built by dux were french and other western aircraft designs. the first aircraft made was a licensed farman iv with env engine, which made its first flight on 18 august 1910. from there, in addition to copies, some improvements were designed for existing models. the first of these was a farman vii in 1912 with some improvements that were put into production. a more ambitious project was the dux meller i which combined a bleriot main fuselage with a farman xv nacelle added, all driven by a 100 hp gnome-rhone in pusher configuration. a modified farman xvi was later produced under the name dux meller ii and flown in 1913. the following dux meller iii was a failed attempt to produce a single-engine twin-propeller chain-driven monoplane. further work went into the dux no 2 but this was also a failure. while engineering continued on a new twin engine pusher, in the end the factory's primary activity was construction of western designs.