Lecoin-Damblanc Alerion
Страна: Франция
Год: 1920
Единственный экземпляр
THE HELICOPTER UP TO DATE: The French "Alerion," a twin-screw direct-lift machine, the patents for which have been purchased by the French Government. The two screws are built as ordinary wings, and will have external bracing
THE DAMBLANC HELICOPTER: Photograph of a scale model of the two direct-lift screws employed on the Damblanc "Alerion."