How could a drone be caught?
I have made a model here unlisted and share it to you via this link, you could download and do anything on it.

I decide to let it go by a detacher, and it is ok, just activate button 1 to go, and this will activate the magnet too, but the detach force is big enough to fly away from the magnetic attraction sphere.
I want to welcome it back by an electromagnet, but I couldn't adjust and optimize the parameters of the electromagnet to attach the drone back. Every time, I will fly over the magnet, without being caught.
I found another trouble, After I fly over the magnet the drone will become to be hard to control, why?
Is there anyone who could help me to retract the drone back? Thanks a lot!