1) Arthur Sack A.S.6: Private circular aircraft, one prototype,
constructed 1944, mostly made of wood with Me-108 cockpit and landing
gear and Argus engine. Flown by Me-163 pilot at Brandis in 1944. A few
hops and crashes due to misplacement of gear, low engine hp, and poor
rear control surfaces. Cut up for firewood. Photos exist- all real and
confirmed.

A simple disc shaped plan form, like any number of other ultra-short
aspect ratio aircraft ideas out of the '30s. Very much not a "UFO" prototypes.

( a lot of silly mostly Sci-Fi style fantasy or, more likely, post war
hoax stuff, though I would concede that there may well have been paper
projects using all kinds of voodoo "science" among the particularly
crackpot fringe of the Nazis)

So Andreas there seems to be a lot of proof that the Nazis were
engaged in disc research throughout the entire war. Many were just
patents and projects but some flew and the most successful are also
the most elusive. As you can see the SS working with Thule/Vril;
forcing Coanda, Schauberger, Schriever, and scientists to perform; and
stealing patents from various nations all played a part in the exotic
disc construction programs.
IMO, the victorious Allies only got the more primitive jet designs
because that is the direction immediate postwar disc programs took. No
equivalent to the RFZ, Vril, or Haunebu series came about until FFX
propulsion became available in the late 80s or early 90s. The supposed
NRO TR-3B ASTRA uses a similar engine to the Thule Triebwerke but is
not a disc- its a black triangle.

Rob

p.s. In the list I did not include the Lippisch disc designs nor the
Hortens because they were strictly postwar studies at the request of
the US.