My first question is: imagine I have a self-made quadcopter and I want it to land. How can I achieve that? Do I have to stop the 4 motors at the same time?
Second question: I use an AR.Drone 2.0. When I send an empty message to the land topic, it lands (measuring the altitude and doing it in a smooth way). What happens when I send the land command? I don't care if you have the documentation about the AR.Drone or another drone. I just want to know how can I achieve the same result. If you have any article or paper or thesis, it will be very welcomed.