The old adage that what goes up must come down seems to apply especially to drones, and during an unplanned descent, their exposed spinning propeller blades can be quite dangerous. As a safer alternative, NTT Docomo, a Japanese mobile carrier, has proposed a camera-equipped blimp that navigates an indoor space using…
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Source : Harmless Sound Waves Propel This Indoor Camera Drone for a Safer, Quieter Experience
