 They published the results in the American Institute of Aeronautics and Astronautics's peer-reviewed "Journal of Propulsion and Power", under the title ""Measurement of Impulsive Thrust from a Closed Radio-Frequency Cavity in Vacuum"".This was released online in November 2016, with print publication in December.The study said that the system was "consistently performing with a thrust-to-power ratio of 1.2±0.1mN/kW", and enumerated many potential sources of error.