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This paper describes theoretical analyses performed on cylindrical and spherical propellant tanks to establish the basis for selection of the proper mode (electric and magnetic field configurations) of operation of the cavity. Extensive experimental investigations were then conducted. Scale models were constructed and loaded under conditions simulating zero gravity and applied accelerations with typical fuels such as hydrazine and unsymmetrical dimethyl hydrazine. The results of these measurements have verified the theoretical predications and have established the basic feasibility of this radio frequency technique.