The Caudron C.440 Goéland ("seagull") was a six-seat twin-engine utility aircraft developed in France in the mid-1930s.

The Renault 6Q, also called the Renault Bengali 6, is an air-cooled inverted in-line six-cylinder, aircraft piston engine, producing about 160 kW (220 hp) continuous power. It was designed and built in France and produced for more than ten years after its homologation in 1936, with large numbers built during World War II.