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Re:Lilium – Electric vertical take-⁠off and landing jet by elmar on Friday April 21, 2017 @05:21PM (#14169523)
the current airtime with current power/weight battery technology should be around 10-15 minutes with 1 passenger.

fixed wing required reserve is 30min, rotorcrafts 20min depends how this vehicle is classified, nevertheless current total airtime is less than reserva.

Re:Lilium – Electric vertical take-⁠off and landing jet by jacquesm on Friday April 21, 2017 @05:46PM (#14169683)
Level flight or in VTOL mode?

Level flight you're probably right (assuming it is even capable of the transition and level flight, I'm not convinced of that, those forward pods add a lot of drag), depending on how much energy you'd lose just from the take-off, landing and the transition. This will give range anxiety a whole new (third) dimension.