![](https://www.historynet.com/wp-content/uploads/2017/08/Autogyro-first960_640.jpg)
On January 31, 1923, the C.4, Cierva’s first successful Autogyro, sets out for a military demonstration flight at Custro Vientos, Spain. (National Archives)
On January 31, 1923, the C.4, Cierva’s first successful Autogyro, sets out for a military demonstration flight at Custro Vientos, Spain. (National Archives)