My approach as a physicist doing fundamental research is: I put a mental black box around the device. I don't want to know how it looks like and what it does in

My approach as a physicist doing fundamental research is: I put a mental black box around the device. I don't want to know how it looks like and what it does internally. To me it's just a box into which some quantum numbers go in and some quantum numbers go out. I don't care about the complexity of your device. It doesn't matter, because that complexity tells me nothing about how the damn thing interacts with the outside world. Now when you speak about magnetic fields, inductors and resonances you're essentially using a lot of words to describe something that has been known for over 100 years and put to practical use in millions of devices: Radio Antennas. The one ring acts like a radiator element and the other ring is an actively driven director. Other names for this are phased array antennas. This is absolutely nothing new under the sun. And yes, this thing produces net thrust, because electromagnetic radiation carries momentum.