A proof-of-concept (POC) prototype of a new thruster technology was experimentally and numerically tested. The technology consists of an axially-asymmetric resonating cavity that is operated with a TM 010 resonating electromagnetic (EM) wave. This new propulsion technology requires no on-board propellant to generate thrust. Numerical method analysis of the POC cavity shows that a differential in axially-directed Lorentz forces is exerted by the contained EM wave on the cavity when operated in the TM 010 mode. Experimental results also show force generation by the POC cavity when powered with phase-locked RF energy. The numerical and experimental results from the POC tests are discussed. Nomenclature All units discussed in this paper are in the MKSA system, unless otherwise specified.