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There is a growing interest for so-called urban mobility in the future which may more and more use small airborne taxis, usually 2- or 4-seated electrically driven aircraft. The aerospace related industry, but also new technology companies are showing an increasing awareness for this potential market, and there have been already several concepts for such light air vehicles announced to the media. Some of these transport vehicles are already flying, some are still in a stage of design study. But for most of them, the fact of using electrical propulsion is leading to a general misunderstanding in terms of “fully quiet air transport”, which obviously cannot be completely true. There are some major noise components, for example hot stream jets that are responsible for exterior noise in specific operational situations like take-off, which indeed will fully disappear. But at the same time, propulsion components like fans, rotors or propellers will remain to be responsible for the predominant noise generation, even may create new additional installation or interaction noise sources. This paper is trying to give a first simple assessment of possible benefits, but also indicate possible disadvantages of urban mobility concepts regarding noise. It may also contribute to raise the awareness that should be given to possible future community noise issues, coming for new urban transportation technologies.
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