The technology for building saucer-shaped aircraft that have amazing flight characteristics is available directly from the US patent office (and most of these patents are now in the public domain).
They aren't exactly alien.
UFOs, or unidentified flying objects, have been observed for most of the existence of Western civilization. But these observed objects may not be as foreign as previously assumed. Patents from the US patent office and other nations throughout the world show that people have at least been attempting to build craft that match the descritption of these so-called "flying saucers."
Patent number 3,774,865, published in 1973, describes a saucer shaped craft that could be used as a passenger craft or even as a toy capable of moving at high velocities and of taking off and landing in a vertical manner.
The Avro Car was developed somewhat along these lines except that it utilized a ducted fan to achieve its lift. It could never get out of its own ground effect (whereby the air pushed down creates a cushion below the craft that it sits on) and the research project was discontinued.
While the above patent utilizes known technology the craft would still have the appearance and maneuverability of that ascribed to UFOs. However, there is more than just a single patent utilizing known technology. There are patents for things like plasma propulsion and magnetohydrodynamic propulsion. It operates by sending high frequency, high voltage elctricity from the top of the craft to the sides or the bottom of the craft. This approach was utilized in Nazi saucers during WWII.
A craft that crashed in White Sands, NM in 1996 appears to utilze the other of the two mentioned technologies; that is plasma propulsion. Plasma propulsion creates an envelope of plasma around the vehicle allowing the vehicle to not only soak in all incoming signals (making it invisible to radar) and to move at unprecidented speeds. A patent published in 1955 boasted 60 times more power than present day rockets.
One thing must be considered and that is the two ways a patent can be validated. The first is with a working model and the second is it is logically provable using main-stream science. The technology powering the craft that are seen doing amazing things has been patented and is mostly within the public domain now. The craft exist and the technology does as well. It is only a matter of time before it is utilized and mankind moves into the space-age.
