This paper presents a thermodynamic and fluid-dynamic evaluation of superfluid helium (He-II) at 2.17 K within a non-chemical electromagnetic propulsion framework (AETHER). By coupling vortex-stabilized cryogenic expulsion with pulse-based thrust control, the architecture bypasses chemical combustion, utilizing He-II for high-flux thermal management while generating directional thrust via high-frequency electromagnetic acceleration of ionized helium plasma.