werkspoor was somewhat active in dutch aeronautical industry. in 1925 it was involved in the construction of the first dutch helicopter by albert gillis von baumhauer. in 1930 klm executive albert plesman ordered werkspoor to create a cargoplane after a design by joop carley. the development of the werkspoor jumbo in cooperation with pander & son was plagued by the engine overheating. in 1931 the "jumbo" made its first flight. the only specimen flew two years as a cargo plane for the klm, and then seven years as a trainer. at the start of world war two the plane was lost in a bombardment.