accumulator 24 operating the linear motor at maximum acceleration force is equivalent to the down stroke of the linear motor pushing the replaceable foot 39 into the ground g operating the linear motor at continuous thrust is equivalent to an up stroke of the linear motor releasing the pressure from the replaceable foot 39 so that less force is exerted on ground g as the preferred embodiment of the invention the electric power accumulator 24 packets of lithium ion batteries ni mh battery packs or similar battery arrangements to those used in hybrid automobiles would be utilized with charging control circuits ac conversion circuits and power output limiting control circuits the configuration would be designed to provide at minimum the required supplemental power for the array of linear motors being utilized at maximum acceleration force over several minutes of duration the capacity of the battery packs would be sized so that the combination of the output of the electric generator 23 and the output of the electric power accumulator 24 would be able to continuously supply sufficient power to the array of linear motors during its activation duty cycle and then charge in a operational acceptable cycle time to be ready for the next duty cycle the operational acceptable time for charging between duty cycles would be equivalent to the time required nominally to move between the desired source activation points on the earth in a second embodiment of the invention the electric power accumulator 24 utilizes a configuration of capacitors to store the electrical power the electric power accumulator could be utilized with charging.