Goo Day hiii_98,
I think this whole UFO topic may have all originated from the Nazi Bell, and that (sorry to dissapoint) UFOs where never flown by scary aliens, but
rather by humans, and covered up by various goverments to this day. If you follow the potential and history of "the bell" you will understand how
all of the exotic technolgy claimed by a UFO could actually have a human origin. Besides the idea of flying saucers did not become popular until
around 1947...after the Nazi defeat...
Allow me to play Devil's Advocate:
First the "Nazi Bell" was a "static device," according to your own source, "Tim Ventura" and by default his, "Nick Cook" et al.
Moreover, Cook writes," it apparently was able create a variety of startling effects on "nearby" [emphasis added] objects.
Those "effects" were "uncontrollable" at the time (end of '44 into '45), as Cook writes, "During the tests, the scientists placed various types
of plants, animals, and animal tissues within the Bell’s sphere of influence. In the initial test period of November to December 1944, almost all of
the samples were destroyed.
People exposed to the program complained of ailments, in spite of their protective clothing. These ranged from sleep problems, loss of memory and
balance, muscle spasms and a permanent and unpleasant metallic taste in the mouth."
The point highlighted here is that although there was some interesting results from the "Nazi Bell" it was far from successful, and understood. SO
taking this "static device" to full fledged "flying saucers" with extraordinary flight characteristics is a bit of a stretch.
Additionally, "Foo Fighters" were reported as early as 1943 (if not earlier) and they were reported by "Allied" pilots as well as "Axis" pilots
alike. Foo Fighters were mainly reported as "balls of lights"; however there were also reports of "flying discs" (i.e. saucers).
Ventura further writes: "Neither the ME-262 nor the Coanda-Effect disk devices were ready in time for use against the Allies . . . its possible to
[emphasis added] that they were trying to leap to a completely electromagnetic propulsion system after realizing the limited
potential in controllability and speed from their experimentation with the Coanda-Effect saucer technology.
To summarize: by "your own" resources "Flying Disks" weren't ready at the war's end, and the "Nazi Bell" wasn't perfected nor completely
Foo Fighters were reported much earlier and weren't exclusive to Hitler's enemies. Moreover, although the thinking at the time (on both sides) was
that the opponent had some "new" secret weapon, there were never any reports of aircraft lost to this phenomenon.
Finally, UFOs have been reported long before the Nazi's came to power; we'll omit the data about the occupants who certainly don't resemble members
of the Aryan race.