The main source of sound emissions from helicopters is the rotors, which produce several types of sound. The causes vary and can include the following:
Engines – and to an even lesser extent the main gearbox – can generate sound, too. But this is mainly noticeable only near the helipad and is less audible from a distance.
To further our research on sound reduction for future fleets, Airbus Helicopters’ innovation and acoustics teams, supported by the French civil aviation authority DGAC, launched a study to measure the sound levels of Airbus helicopters perceived by urban residents. The objective is to understand, predict and improve the social acceptability of VTOLs in urban areas and influence the design of future eVTOLS.