The prototype ion-powered drone lasted more than 4 minutes in the air - it has no propellers at all.

Startup Undefined Technologies announced that it was able to prove the commercial viability of an ion-powered drone project. Having no propellers or any other mechanics, the "silent" Silent Ventus drone lasted 4.5 minutes in the air. Such a device promises to be convenient in the city, where it will not disturb residents with noise during the delivery of goods.