A video caught my eye on fb but it wasn't what I expected -
The video shows a quadrocopter with some coils around the outsides of the motor arms flying over an array of coils, inducing a current on the stationary coil to power a small LED light.
https://www.youtube.com/watch?feature=player_embedded&v=iE9hwguNQyg
Then I watched this video that shows wireless power transfer - used to charge electric toothbrushes for example.
https://www.youtube.com/watch?v=r1UT4NuygmQ&feature=related
The video clearly shows that there is a narrow band that the receiver has to be in for it to power the LED.
I'm thinking if there were a long-range version of this that could also track the multicopter, if it were kept in line-of-site, it might be able to power the multicopter, saving about 1.5Kgs in batteries.
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