You started off talking about how a supercooled electromagnet sounds like a theorised UFO operating mechanism which involves electrogravitics. When pushed, you suggested rotation was involved. When pushed again, you linked to a patent which presumably was related to your statements, but instead it describes an atmospheric electricity harvesting pyramid. It insists the device must be pyramid shaped and not boxy, and that the pyramid must be big - 150m high and with a 40,000 square metre base. The shape is important for the described effect to happen, and the size is important to have enough voltage difference between base and peak. NB. this thing is HUGE, the base is the area of a soccer pitch, and the height is more than 3x higher than the Hindenburg, the biggest flying machine ever built. [Aside, it's claimed that the pyramid will have a 30kV potential difference between base and peak; how come I don't get electrocuted when I stand up if the 200V/meter potential gradient near the surface of the Earth claim is correct? How come we don't get this power generation at all from 600m high asymmetric skyscrapers with steel superstructures?]. This pyramid will harvest atmospheric / thunderstorm electricity and be a power supply for civilization. The patent then moves on to describing a vehicle with a spehrical capacitor small enough to go in a vehicle and a rod sticking out the top which must be positively charged, with no explanation where the pyramid or the massive size requirements went, or how or why the capacitor will do anything of any interest. Is it really suggesting "put a rod in the air and electricity will flow"? Because a) yes that happens, they're called aerials and they put out small amounts of electric signals and they don't take off, and b) wouldn't that happen with lightning conductors on buildings, and they be used as power supplies?. Still, put that aside and see how the patent describes the mechanism of operation:

"When all capacitor plates are charged, a pressure differential is
induced and above the craft the pressure will be higher than
at the bottom of the craft. This pressure differential is
unstable and progresses towards an equilibrium. It will
propel the craft forward in order to eliminate the pressure
gradient."

(Like a wing, air will move, faster moving air is lower pressure, slower moving air is higher pressure, the air pressure dfferential pushes the craft, right?). That is, the patent you linked to to explain how UFOs might be powered by a device like a supercooled electromagnet with an antigravity effect using electrogravitics and involving rotation, describes a thing which doesn't involve supercooling, or electromagnets, or electrogravitics, or antigravity, or rotation(?!).

There exists a MagnetoHydroDynamic drive, it's able to push seawater using only electricity and no other moving parts, and there is a ship called Yamato 1 built to experiment with it: https://en.wikipedia.org/wiki/Magnetohydrodynamic_drive that's cool. There exists a small airplane built by MIT which uses high voltage wires and no moving parts to generate an ionic wind to lift itself: https://news.mit.edu/2018/first-ionic-wind-plane-no-moving-p... that's cool. Biefeld-Brown lifters are interesting.

Connection to UFOs, antigravity, or the experiment with the nail described in this thread, still not apparent.