 The 249 cc Carden-Baynes Auxiliary is believed to be the lowest-powered aircraft in the history of powered flight.During the war part of Villiers production was again turned to fuses for shells, with over 10 million produced, although they continued to make engines and cycleparts.Their engines were also used in small motorcycles designed for air drop with paratroopers – the Excelsior Welbike and the James ML paratrooper's machine known as the Clockwork Mouse.