A new drone which flies almost silently without wings or propellers has raised questions about how many supposed sightings might actually be man-made craft.The Silent Ventus drone, made by Florida-based start-up Undefined Technologies, uses ion propulsion, with electrodes ionizing the air to generate thrust, and flies incredibly quietly.It can also hover in the air against winds - a feature of many UFO sightings by military personnel.
Load More
Load More