Exquadrum proposes a high-performance liquid bi-propellant rocket engine that uses propellants that are non-toxic, self-pressurizing, and low cost. The proposed engine and propellants provide the same performance as state-of-the-art storable propellants. The propellants are storable for long durations without decomposition or degradation. Because the propellants are self-pressurizing, they offer the potential for overall system weight savings by eliminating the pressurization system. In Phase I, Exquadrum will develop this engine concept through trade studies and analyses and conclude with a proof-of-concept hot fire demonstration of a full-scale laboratory engine. In Phase II, Exquadrum will mature the engine design to detail design, and deliver a full-scale engine to NASA for functional and environmental testing under simulated mission conditions.