The companies that make eVTOLs promise that these electric air taxis will be much quieter
Joby Aviation evaluated the acousticperformance of their eVTOLs by working with NASA through the Advanced Air Mobility National Campaign. One of Joby's helicopters, the S4 prototype, flew over NASA's Mobile Acoustic Facility. This is a field array of over 50 microphones. The prototype was flown at various altitudes and speeds to create a model of its acoustic signature at various stages of flight.
45.2 dBA at 500 m overhead and 65 dBA at 100 m at takeoff, the eVTOL Joby will be much quieter than a helicopter and closer to normal city sounds. Joby Aviation
The company published figures obtained inthe result of these tests. Firstly, when the S4 is flying overhead at 100 knots (185 km/h) and at an altitude of 500 m, the noise level is within 45.2 dBA on the ground. It's somewhere between "refrigerator" and "rain sound" on the decibel chart. According to Joby, the sounds of cars "will be barely noticeable against the background of the urban environment."
Secondly, during takeoff and landing of the aircraftthe noise level, measured at 100m from the heliport, remained below 65dBA in more than 20 tests, when the aircraft ascended or descended from a height of 44m. On the decibel charts, this is somewhere between “normal conversation” and “vacuum cleaner sound” .
As a result, eVTOL Joby will be much quieter than a helicopter, and closer to the level of ordinary city sounds.
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