Some of the first models of the autogiro, the predecessor of helicopters, designed by Juan de la Cierva. Its first succesful flight was a 183 m "jump" achieved in 1923 in Getafe,
Contributions of the Autogyro - Aviation History - Century of Flight
Hafner A.R.III Gyroplane - Wikidata
Mathematics | Free Full-Text | On the Stability of la Cierva's Autogiro
Category:Autogiro Company of America AC-35 - The Internet Movie Plane Database
The magnificent Pitcairn PA-19 cabin autogiro. My plan to resurrect this type: Step 1, get all the money in the world. Step 2, have o… | Вертолеты, Авиация, Самолет