I find Neil deGrasse Tyson to be a terrible science communicator, especially since a few years back. Just look at the man's twitter. Putting him and Carl Sagan in the same sentence is almost insulting x)
> Autorotation is the ability of a helicopter to in some situations have its rotors powered by the flow of air rather than the engine. In short, as the helicopter descends, the upward directed flow of air pushes through the rotors, makes them rotate faster, which in turn provides lift.
see the "dead man's curve" which relates to having an engine failure with insufficient height or lateral speed (helicopters shouldn't hover in place unless a good ways up) https://en.wikipedia.org/wiki/Helicopter_height%E2%80%93velo...