Originally Posted by
etudiant
The ESA web site so helpfully referenced says the concept has been 'validated ...with several scaled prototypes weighing 25 kg'.
It goes on to say that Lilium is now developing its first product, a two seater ultra light...
I think that settles the matter, the video is of one of the prototypes.
Indeed, the slow speed flight dynamics certainly do indicate that this scaled prototype in the video was
25 kg