Abstract:The idea of manipulating and using the energy associated to electrodynamic quantum vacuum, also known as Zero Point Energy (ZPE), for technological applications as, for example, interstellar space propulsion, represents one of the most challenging question both in theoretical and applied physics. During the past years B.Haish, A.Rueda and H.E.Puthoff proposed a model according to which inertia could be considered as the electromagnetic reaction force to interaction between a body and quantum vacuum zero point field (ZPF), opening interesting perspectives about manipulating inertia by electromagnetic fields. Nevertheless this theory, although interesting from both a theoretical and applicative point of view, is for from being complete and presents some questionable points. More recent results have suggested a novel model of quantum vacuum, ruled by "Planck metric" and characterized by an energy density field, able to give a novel interpretation of mass and gravity in terms of variation of such energy density. In this paper we'll propose an extension of this model allowing the theoretical possibility of inertia and gravity strength manipulation, as well as a more fundamental theoretical explanation of some assumptions of the Haish, Rueda and Puthoff model. In particular, it will be shown that not only inertia but gravitational "constant" as well can be expressed as functions of quantum vacuum energy density, analyzing their relationships with the electromagnetic field, described by vector potential. Finally we will discuss the possibility of space propulsion system by considering the interaction between the zero-point field of the quantum vacuum and the high potential electric field generated in an asymmetrical capacitor, showing the resulting force is driven by quantum vacuum energy density.