Can a surveillance drone be made virtually invisible? A US company thinks so, and their patent application explains how.
"Persistence of vision" turns the fast-moving rotors of any helicopter into a near-transparent blur, while the slow-moving body looks solid. So why not make the entire aircraft spin as it flies, turning it into a single faint blur in the sky?
Find out more, and view the design drawings and a demonstration video, here: the link
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