Second-stage launch vehicle developed by ABL Space Systems using their E2 RP-1/LOX rocket engine. Nine engines are used in the first stage and one in the second stage. The RS1 is designed to be deployed and launched from any suitably flat site using a containerized launch system transported by trucks.
ABL Space Systems is an American company based in El Segundo, California, specialized in launch vehicle and launch systems technology manufacturing using CNC and 3D printing.