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aircraft identification - What is the definining line between a helicopter and a drone a person can ride in? - Aviation Stack Exchange
Leonardo unveil new British 'Proteus' helicopter drone
helicopter | GIZMODO.cz
This Helicopter Drone Looks Like Something Robots Would Use to Take Over the World - autoevolution
Le drone hélicoptère d'Airbus parvient à se poser sur un navire par temps agité !
PDH-GS120 - Prodrone | Revolutionary Drones for Professionals