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Ah interesting.

I don't understand much about efficiency, but after reading http://www.geek.com/science/weve-been-designing-quadcopters-... I thought that a big rotor was inherently more efficient, so how can this design be more "green"?

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I am not into flying, but last time I was a passenger I remember that a helicopter engine needs a certain cooldown time after landing which could be around 30 minutes. In this time the engine needs continue running. My guess is that the electric motors in the Volocopters do not have this requirement.

But again, I am not a helicopter specialist.

It is "green" because the emissions are out of sight out of mind..

Just ignore the coal plant in the background.

To be fair, people who get involved in developing green tech these days are fairly likely to have bought solar panels, especially given the price of them.

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