Instead of costly camouflage or advanced stealth technology, Northwestern University researchers designed a drone whose entire body spins up to 25 times per second, turning it into a faint blur that is about 10 times harder to see than a conventional quadcopter

Researchers demonstrate that something interesting happens when a small drone with a spindly airframe spins at a high speed: it very nearly turns invisible. The spidery device is…

The drone chassis spins at 25 RPM and, thanks to a quirk of human vision, it appears like a faint smudge in the air.