A dipolar force field propulsion system having a alternating electric field source for producing electromotive lines of force which in a first direction and which vary at a selected and having an electric field of a predetermined magnitude, a source of an alternating magnetic field having magnetic lines of force which in a second direction which is at a predetermined angle to the first direction of the electromotive lines of force and which cross and intercept the electromotive line of force at a predetermined location defining a force field region and wherein the of the alternating magnetic field substantially equal to the of the alternating electric field and at a selected in phase angle therewith and wherein the magnetic field has a flux which when multiplied times the selected is less than a known characteristic field ionization limit; a source of neutral particles of matter having a selected dipole characteristic and having a known characteristic field ionization limit which is greater than the magnitude of the electric field and wherein the dipoles of the particles of matter are capable of being driven into cyclic rotation at the selected by the electric field to produce a reactive thrust, a vaporizing stage which vaporizes said particles of matter into a gaseous state at a selected temperature, and a transporting system for transporting the vaporized particles of matter into the force field defined by the crossing electromotive lines of force and the magnetic lines of force.