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Sounds plausible but I haven't read about this before and would like to know more, do you have a reference handy?

In regards to turning on the z-axis to be able to land with engine failure, I believe User is referring to Autorotation: http://en.wikipedia.org/wiki/Autorotation

No, it's not autorotation. Here's a lovely demo:

https://www.youtube.com/watch?v=ek0FrCaogcs&feature=youtu.be

I thought autorotation was only useful if you're moving ahead very fast (high ground speed) while also falling. Is that right? Most drones are essentially hovering much of the time.

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