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Re:NEC shows ‘flying car’ hovering steadily for minute by sschueller on Wednesday August 14, 2019 @04:24AM (#20693648)
From what I have read and seen a drone with only 4 props has almost no chance of recovery if one prop fails. This is also why drones for high end expensive video have six or eight props to prevent a catastrophic failure resulting in loss of equipment.
Re:NEC shows ‘flying car’ hovering steadily for minute by satori99 on Wednesday August 14, 2019 @04:31AM (#20693677)
There are algorithmic solutions to maintaining some semblance of flight with a damaged quad copter, even down to one remaining prop, however it involves spinning the entire air-frame to stay aloft -- which means it is probably not suitable for a human passenger drone

https://newatlas.com/quadcopter-failure-algorithm/30031/