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Engineering behind the Lilium Jet

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Okay, it's not a jet, it's multiple ducted fans but we'll forgive them that.

At first glance you would think that lots of mini fans would be inefficient due to the higher RPM required to generate enough thrust. And we'd be right but that only allies to the brief time spent hovering. Most of the flight is in the cruise where the lack of drag from big props pays dividends.

 

 

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That's what I like about these eVTOL's. So many different concepts being developed. Everything from multiple ducted fans to Dyson hairdryer style bladeless fans. 

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