Is there enough data to determine the weakest weakness?  Energy makes logical sense, it is also fairly easy to fix with an auxiliary energy supply that could kick in in an emergency situation.  That&#x27;s fairly easy logic to build as well, it seems like something a pro video drone might already have.  They don&#x27;t have a lot in the way of instruments typically, do they have wind gauges and such on the bigger more professional drones?  We only see the bottom of the crash, could it have rolled from a gust of wind and become unstable and just not recovered in time? How do you monitor ice build up?  How stable are they when a single motor fails?  What about the base station?  My cheap qav250 drops like a stone when I flip the radio power off, that opens the door to a lot of other potentials for failure, including interference, I know many have gps and return home functions when they lose signal but those are options that are added on.  what about a vps signal failure which isn&#x27;t that unusual in the mountains...<p>I guess the issue at hand becomes cost, between licensing, insurance and then building devices that are higher quality as if they could endanger life, I suspect they&#x27;ll be cheaper than planes and helicopters but quite a bit more costly.