Hyperion-I is ASPEN’s first engine modeling a solid-core nuclear thermal rocket engine using an inductively heated, additively manufactured metallic core. An overarching view of the development campaign for Hyperion-1 includes three Phases of modeling and hardware testing. Experimental data from each phase will be compared to corresponding linked multiphysics models in ANSYS. Three test articles, starting with a single tube and ending with a full printed core, will be tested with gaseous nitrogen while in an inductive heating environment used to model the nuclear fission that occurs in true solid-core nuclear thermal engines.