Couzinet 70

The Couzinet 70 was a 1930s French three-engined commercial monoplane built by Société des Avions René Couzinet founded by René Couzinet.
Design and developments.
The Couzinet 70 "Arc-en-Ciel III" ('Rainbow') was developed from the 1920s Couzinet 10 "Arc-en-Ciel", which first flew on 7 May 1928, the Couzinet 11 and Couzinet 40. The slightly larger span Couzinet 70 was developed originally as a mail plane for use of Aéropostale's South Atlantic service. It was a low-wing monoplane with a fixed tailwheel landing gear. The aircraft was powered by three Hispano-Suiza 12Nb inline piston engines. The two wing mounted engines could be accessed in flight through tunnels in the wing. After route-proving in 1933 the aircraft was modified and re-designated the Couzinet 71 and entered service with Aéropostale in May 1934.