DC-X

Delta Clipper Experimental SAS-2 (Single-stage Advanced Suborbital)

Mission Profile

The DC-X (Delta Clipper Experimental) was a single-stage suborbital test vehicle built by McDonnell Douglas for the U.S. Strategic Defense Initiative Organization to demonstrate vertical takeoff and landing propulsive recovery technology for a future single-stage-to-orbit concept. Standing 12.1 m tall with a 4.1 m diameter and a liftoff mass of 18,900 kg, it generated 267 kN of thrust from four RL-10 engines in its unique conical aeroshell. Completing 12 test flights between 1993 and 1996, the DC-X successfully demonstrated rapid vehicle turnaround and VTOL recovery that directly influenced SpaceX's Falcon 9 first-stage landing approach decades later.