Undefined Technologies has unveiled the new design of its concept eVTOL drone named the Silent Ventus. The drone is powered by proprietary ion propulsion technology, creating "high levels of ion ...

If there’s one hard-to-ignore annoyance with drones is noise pollution, with these otherwise extremely useful aircraft being quite loud due to their propellers. This Florida-based startup plans to ...

According to Undefined Technologies, which just debuted a new outdoor flight test video, Florida's "silent" flying dish-rack, propelled by ionic propulsion, is scheduled to go into general production ...

A new drone which flies almost silently without wings or propellers has raised questions about how many supposed UFO sightings might actually be man-made craft. The Silent Ventus drone, made by ...

Concept: Florida-based startup Undefined Technologies (Undefined) has tested the flight of its electric vertical take-off and landing (eVTOL) ion propulsion drone called Silent Ventus. The eVTOL has ...