What are the tech specs of this thing? What altitude does it fly at? Does it use the ground effect for efficiency? If not, the claimed range seems a little too futuristic with current battery technology. 150 KW for flight ("it will require less than ten per cent of its maximum 2000 horsepower during cruise flight") x 1 hour range = 150 KWh and that's going to weigh more than the maximum takeoff weight of 640 Kg according to https://en.wikipedia.org/wiki/Lilium_Jet ...