Inspire 2 Drone Sound in Decibels Altitude Sound
Ambient Noise (no drone)
Drone motors idling
Our flight altitudes generally ranged between 150 and 200 feet, so the decibel level of those deliveries was probably in the 47 to 50 dB range. The highest decibels anyone would hear were upon landing when the levels reached 68. That is slightly louder than a normal conversation and well below the NIOSH standards for preventing hearing loss. 9.10 Proof of Concept 4: Delivering a package to a Drone Mailbox Proof of Concept 4 demonstrated the AirBox Technologies solar-powered, secure, Internet-connected delivery receipt box. A signal was sent from the authorized drone operator to open the box, and the package was dropped into it using a controlled magnet at the end of a tether connected to a winch.
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