I am still working on my research project (private, snail pace) on figuring out how the Haunebu flew. The Vril and RFZ ships are included, all basically the same groups in Germany; Thule and Vril, nearly identical gravity engines.
A couple of things I have noticed on these;
* They have a Marconi Vortex dynamo in the center with mercury in it. Some say heated, I dont know. This is spun inside of a vacuum and from what I gather, arcs of electricity occur that bounce from the round core to the round outer shell, which is where the inner edge of the disc gyro are at, so the arcs must help produce the 'electrical' field which the gyro flings outwards.
* Later versions have a coil near the top, some a flat coil (see Tesla) and some a coil like an inductor coil, resembling a ring with copper wrapped around it, all the way around. This must improve handling, like a spike damper.
* They have a Glocke (Bell) inside the Sphere core which is upside down with the large area dome pointed up. On a drawing of the Haunebu III, this is referred to as a Radar tube, a specific model Pentode (I think I misspelled that). I am going to guess this is a 'frequency' generator, perhaps microwave square band? This must have something to do with lift.
* They have magnet coils at the edges of the disc. This must be their 'impulse' system they talk about for handing, turning in horizontal flight. They were noted by fighter pilots in WWII that could try to chase them, that they turned in exact angles. This must be from the few magnet points on the circumference of the gyro disc.
* The Thule engine appears to have 'movement marks' on the chassis that supports the gyro. My guess is that the gyro is moved up and down 'around' the sphere Marconi unit. This must effect lift and perhaps also trim for amount of weight on board.
Learning more and more with the limited data... If only I had one to work on, photos of these things, the insides, the guts, the mechanicals, notes....