| The Columbia Encyclopedia, Sixth Edition. 2001-07. |
| Cierva, Juan de la |
(hwän d lä thyr´vä) (KEY) , 1895–1936, Spanish aeronautical engineer, inventor of a rotary-wing aircraft called an autogiro. He flew his first autogiro in 1923 and crossed the English Channel in an improved model in 1928. | 1 |
| See his Wings of Tomorrow (1931). | 2 |
| The Columbia Encyclopedia, Sixth Edition. Copyright © 2007 Columbia University Press. |
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