Often touted as science fiction, electro-gravitic propulsion is the displacement of an objects mass through the use of electrically generated fields. Many theories have been developed in regards to the exact methods used to power craft at high speeds without combustion technology. One of the dominant theories involves the creation of a 'gravity well' with high current equipment onboard the vehicle. This gravitational void can be projected in any direction and creates a gravity displacement which the vehicle then 'falls' into.
Numerous researchers have embarked on proving electro-gravitic propulsion methods which are then generally classified by the government. One such researcher would be John Hutchison who created a field in his workshop which caused solid objects and liquids to rise into the air. Other effects were also filmed including a process of molecular separation of metal similar to that reported by witnesses to The Philadelphia Experiment.
Anyone embarking on any serious research into this field should be prepared to expect the otherwise cliched 'men in black' to show up in the event of any major success.