Abstract: A propulsion system (10) which is designed to be used on a payload platform (90) such as a spacecraft, satellite, aircraft or an ocean vessel. To operate the system (10) electrical power is required. However, during operation the system (10) does not require fuel or other mass be expelled into the environment to move in space. The system (10) is designed to operate in two operational modes: in Mode I the system (10) incrementally moves the payload platform (90) forward with each operational cycle. In this first mode, the velocity imparted to the payload platform (90) is not additive. In Mode II the payload platform (90) accelerates forward a discrete increment of velocity during each operational cycle. In this second mode the increments of velocity are additive.