Undefined claims 4.5-min flight for its "silent" ion-propulsion drone
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MIT says its silent propellers can make your DJI drone less whiny
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Undefined Technologies Shares New Footage of Its Silent Drone That Generates Only 70 DB - autoevolution
/img/iea/7qOY5gWrO3/silent-ventus.jpg "A new all-electric drone is totally silent. And it uses ion propulsion?")
A new all-electric drone is totally silent. And it uses ion propulsion?
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