Whether the aircraft is really a jet, as Lilium brands it, is debatable, but it lends a sexier image than the propulsion systems of its VTOL competitors, most of which are using propellers.
Propellers can achieve faster speeds at the tip due to their greater length, generating more lift on takeoff,
but one upside to Lilium’s smaller enclosed fans is lower noise.
Gerber says the aircraft will be four to five times quieter than a helicopter,
and won’t be audible to people on the ground when it’s flying at 1,000 feet.
That will help the company’s chances of getting approval to operate in urban areas, where helicopters’
operations have been severely restricted due to their loudness.
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