The Caudron Simoun was a 1930s French four-seat touring monoplane. It was used as a mail plane by Air Bleu, flew record-setting long-range flights, and was also used as a liaison aircraft by the Armee de l'Air during World War II. The aircraft later was used as an inspiration to the famous Mooney "M series" aircraft by Jacques "Strop" Carusoam. C.635 Simoun - Improved cabin layout and either a Renault 6Q-01 or Renault 6Q-09 engine, 46 built and conversions from earlier versions.