> Generally speaking, if your drone starts spinning incredibly fast, you have a serious problem. But here’s the twist: (ba-dum-tsss) with the right design, spinning actually provides a substantial increase in hovering efficiency due to some clever exploitation of the laws of physics.
Part 2: <a href="https://www.youtube.com/watch?v=I3D559DNa04" rel="nofollow">https://www.youtube.com/watch?v=I3D559DNa04</a>