I must confess that my knowledge of physics, and I am talking here about classical physics, is very limited. In regard to electro-gravity technology. what I could find was this
Electrogravitics is claimed to be an unconventional type of effect or anti-gravity force created by an electric field's effect on a mass. The name was coined in the 1920s by Thomas Townsend Brown, who claimed to have discovered such an effect and spent most of his life trying to develop it and sell it as a propulsion system. Through Brown's promotion of the idea, it was researched for a short while by aerospace companies in the 1950s. Electrogravitics is popular with conspiracy theorists, with claims that it is powering flying saucers and the B-2 Stealth Bomber."
