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Re:New Electric Drone Has Groundbreaking Flight Time by thx11389793 on Monday September 17, 2018 @12:10PM (#18007209)
autorotation requires control of blade pitch.
Re:New Electric Drone Has Groundbreaking Flight Time by perilunar on Tuesday September 18, 2018 @06:10AM (#18013924)
It certainly does in helicopters, which have large, relatively heavy blades you really don’t want to stop turning.

In a quadcopter the blades a small and light, so you could conceivably stop them and let them turn them in reverse as the airflow changes direction (from downwards to up through the blades). I think there would be real problem with control during the transition, and you’d need a lot of height to make it worthwhile.