Stormbreaker said:
The top four images posted by Hesham are claimed to exist by someone who worked at at a USAF base during the 1960s. Whether or not they are fakes is debatable, although I think the probability of anyone designing anything as badly as this is highly unlikely.
I absolutely agree with Stormbreaker.
Aeronautics, as a lot of human activities, is subjected to fashion.
During '50s and '60s flying disks were in "fashion", so a lot of concept and design come out.
But any of that ones proof to be effective or viable, that's all.
Indeed NACA first and NASA after did a lot of researches about flying disks, trying to use them as reentry vehicles.
Even in this case the design was lacking of stability and was to unlikely to be realized, especially compared with the performances of lifting bodies.
The only flying disks really utilized in space field are for sure the aeroshells for interplanetary probes as Vikings, Galileo, Huygens and so on...