Development and Innovation
Following the catastrophic loss of the Couzinet 10 long-range aircraft, René Couzinet embarked on a substantial redesign of the project. This significant effort culminated in late 1928 with the emergence of the second “Rainbow,” officially designated as the Couzinet 27 Arc en Ciel.
Technical Specifications
The new aircraft featured a modified fuselage and a powerful, innovative propulsion system. It was equipped with two Hispano-Suiza 8Ac engines, each delivering 180 hp, mounted under the wings. Additionally, a single 600 hp Hispano-Suiza 12Lb engine was strategically placed in the nose.
These advanced modifications dramatically enhanced the aircraft’s capabilities. The practical range of the Couzinet 27 was successfully doubled, allowing it to achieve an impressive operational distance of up to 6000 kilometers.
A Tragic End
Despite its promising advancements, the Couzinet 27 Arc en Ciel’s career was cut short. The aircraft underwent a series of rigorous tests, but its journey tragically concluded on February 17, 1930, when it was destroyed by fire along with its hangar.
Technical Specifications
| Modification | Couzinet 27 |
| Wingspan, m | 27. 00 |
| Length, m | 15.68 |
| Height, m | 3. 90 |
| Wing area, m2 | 92. 75 |
| Empty weight | 4 900 |
| Maximum takeoff weight | 10230 |
| Engine type | 2 Piston engine Hispano-Suiza 8Ac + 1 Piston engine Hispano-Suiza 12Lb |
| Power, hp | 2 х 180 + 1 х 600 |
| Maximum speed, km/h | 240 |
| Cruising speed, km/h | 205 |
| Practical range, km | 6000 |
| Practical ceiling, m | 6800 |
| Crew | 4 |
Image and diagram gallery of the Couzinet 27 Arc en Ciel
 Couzinet 27 Arc en ciel |
 Couzinet 27 Arc en ciel |
 Couzinet 27 Arc en ciel |