Nieuport-Delage NiD 640

The Nieuport-Delage NiD 640 was a four-passenger transport monoplane designed and produced by Nieuport-Delage in the late 1920s, mainly as a civil aircraft but with provision for military use. It had a highly efficient elliptical wing, an easily swappable engine arrangement and much metal in its construction, and was fitted with dual flying controls so that up to four trainees could be taught during one flight. The baggage hold could also be adapted to carry wounded personnel as an air ambulance. First flown in 1927 and introduced during 1930, the single NiD 640, with a 160 kilowatt Wright J-5C radial engine, was soon joined by twelve NiD 641 production aircraft with a Lorraine 7M Mizar radial, most of which flew the civil routes of the Societe des Transports Aeriens Rapides. A single NiD 642 went unsold and was scrapped.