FLYING a helicopter is tricky, especially when hovering. You use your left hand to raise and lower the collective-pitch lever (to climb or descend), your right hand to move the cyclic-pitch joystick (to go forwards, backwards and sideways) and both feet to work the anti-torque pedals (to point the nose). At first it all seems like an impossible dance, but with plenty of practice and careful co-ordination it can be mastered. Flying a drone, by comparison, is easy-peasy. Some can be operated with little or no experience using only a smartphone app. So, it was a matter of time before resourceful folk started to think about building simple-to-operate drones that are large enough for people to fly in.
Tomado de "The Economist" Jun 25th 2016
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