KISS is a Nitrous Oxide - Ethanol bi-propellant liquid rocket aiming to reach 55,000 ft and Mach 2.5. Inspired by HalfCat Rocketry’s HCR5100, it uses nitrous oxide as a self-pressurant and a piston to push propellants into the engine.

The SMOOCH engine utilises a co-axial shear injector to promote excellent propellant mixing. It is regeneratively cooled by flowing fuel through the chamber walls, and Aluminium 3D-printing to create the complex shapes.