Kellett KD-1
| Kellett KD-1 | |
|---|---|
| Kellett XR-3 modification of YG-1B (KD-1) of U.S. Army preserved at Yanks Air Museum, Chino airfield California, in February 2016 | |
| Role | Autogyro | 
| National origin | United States | 
| Manufacturer | Kellett Autogiro Company | 
| First flight | 1934 | 
| Primary users | United States Army Air Forces Eastern Airlines  | 
| Developed into | Kayaba Ka-1/Ka-2 | 
The Kellett KD-1 is a 1930s American autogyro built by the Kellett Autogiro Company. It had the distinction of being the first practical rotary-wing aircraft used by the United States Army and inaugurated the first scheduled air-mail service using a rotary-wing aircraft.