Airbus Helicopters is tapping in-house efforts to reduce helicopter noise with both technology and new operating methods to influence its design work for its planned eVTOL aircraft. The European manufacturer feels that achieving acceptable noise levels will be critical to winning public acceptance for future urban air mobility operations.
While the company’s Fenestron tail rotor and Blue Edge main rotor blades can reduce a helicopter’s overall noise signature, Airbus is continuing to explore ways to minimize other variables that can be irritants to the human ear including impulsive, tonal, and high-frequency sounds, as well as the duration of the sound exposure. An example of impulsive sound includes the common “blade slap” generated by the intersection of the main blades’ vortex trail with subsequent blades.
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