Nothing to do with drones But RC Helis… I used to fly RC helis like 20 years ago. Gave the hobby up just to dam expensive as I always crashed, and my skill level was no where near these guys…Still enjoy watching Helis…
Watch this flight Flight starts at 0:40… Awesome and truly gravity defying
Watch at 4:00. inverted touching the ground…
Baffles the hell out of me, how a helicopter can do that! 
insane! Great share 
Amazing skill!!
There are a few good ones out there, this bloke is good, even some grass cutting from 6.40 
I used to fly RC helis not to that extent but your right its very expensive.
It doesn’t look real, it looks like a sort of video made in the 80s with bad graphics lol