lilium

now that lilium aerospace has built a functioning vtol prototype that has taken off and landed vertically and flied forward 
it seems to work efficiently enough 
so I must say that clusters of small jet motors vtol are preferable to quad rotor vtol 

folding small jet motors are on top of the back of the wing 
if more lift is needed folding small jet motors could possibly be placed under the front of the wing 

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