UFO enthusiasts know a thing or two about the UFOs made by Hitler in Germany during World War II. Many people are skeptical. However, recently, UFO enthusiasts have studied the principles of UFO manufacturing in Nazi Germany.
As can be seen from the figure below, the basic principle of manufacturing UFO is that the dish-shaped machine generates a small tornado above it, attracting the dish-shaped machine to rise like a hot air balloon. If this tornado can exist stably, the lift produced can be very stable, just like a hot air balloon. Compared with propeller aircraft, it can fly without complicated flight control. However, only the Germans know how to keep the tornado stable and how to let the tornado "lead" the disc-shaped machine forward.
In short, I think the use of this kind of disc player has great limitations and cannot be used intensively. Once the disc-shaped machine flies over the disc-shaped machine, it will be involved in the high-speed updraft generated by the disc-shaped machine below. And the requirements for the weather are very high. So there is basically no practicality.
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