>line-of-sight quad-copters that can stay up for 20 minutes 10 minutes is the median, but they don't have to be line of sight, except as bound by regulation su

>line-of-sight quad-copters that can stay up for 20 minutes 10 minutes is the median, but they don't have to be line of sight, except as bound by regulation such as in the UK [0]. Still short-range though, and certainly not suitable for this use-case. [0] http://en.wikipedia.org/wiki/First_Person_View http://en.wikipedia.org/wiki/First_Person_View