This paper summarizes preliminary experimental and theoretical research that was directed towards the study of quasisteady-state power flow in a large, un-optimized, multi-megawatt coaxial plasma thruster. The report addresses large coaxial thruster operation and includes evaluation and interpretation of the experimental results with a view to the development of efficient, steady-state megawatt-class magnetoplasmadynamic (MPD) thrusters. Schoenberg, Kurt and Gerwin, Richard and Henins, Ivars and Mayo, Robert and Scheuer, Jay and Nurden, Glen Unspecified Center...