"A net unidirectional and reversible force on the order of ± 3.14 milli‐Newton or 0.069% of the suspended test article mass was recorded by us in our first high frequency 2.2 MHz test article. The authors also developed a W‐E model that integrates the various engineering parameters affecting the design, construction, and performance of W‐E based MLTs for the next generation of systems. When Woodward’s (2004a, 2004b, 2005) and our test results were compared with the model’s predictions, the test results exceeded predictions by one to two orders of magnitude. Efforts are underway to understand the discrepancies and update the model. The test results imply that these devices, when fully developed, could be competitive with ion engines intended for use on satellite station keeping and/or orbital transfers."
http://scitation.aip.org/content/aip/proceeding/aipcp/10.106...