NISKAYUNA, N.Y. — On Wednesday, January 14, 2026, GE Aerospace and Lockheed Martin announced the successful completion of a series of engine tests for a liquid-fueled Rotating Detonation Ramjet (RDR). The ground-based demonstrations, conducted at GE Aerospace’s research facility, validated a propulsion system designed to enable missiles to fly at hypersonic speeds exceeding Mach 5 with significantly increased range.
Closing the Efficiency Gap in Hypersonic Flight
The demonstration is the primary initiative under a joint technology development agreement established between the two aerospace majors. While traditional ramjets require a missile to reach approximately Mach 3 before ignition—often necessitating large, heavy rocket boosters—the RDR architecture is engineered to ignite at lower speeds. This allows for the use of smaller boosters, which reduces the overall weight and production cost of the weapon system. The project follows two years of internal investment by both firms to address the “efficiency gap” currently hindering the mass production of hypersonic platforms.
Technical Specifications and Combustion Architecture
Unlike conventional engines that rely on steady-state combustion, the RDR utilizes continuous detonation waves to burn fuel and air. This process is estimated to be approximately 25% more efficient than standard rocket propulsion, generating higher specific thrust while maintaining a compact form factor.
- Propulsion Type: Air-breathing, liquid-fueled Rotating Detonation Ramjet.
- Velocity Threshold: Mach 5+ (Hypersonic).
- Inlet Design: Lockheed Martin tactical inlet optimized for high-speed airflow conditioning.
- Operational Versatility: Designed to act as both a ramjet and a scramjet by tuning to the rotating detonation core, maintaining stability across varying altitudes.
Leadership on Collaborative Innovation
“The testing on the rotating detonation ramjet and inlet exceeded expectations,” said Mark Rettig, vice president and general manager of Edison Works Advanced Programs at GE Aerospace. “We are excited about this collaboration to continue maturing our advanced air-breathing hypersonic propulsion technologies.”
“Following two years of internal investment, this demonstration is a testament to the power of collaboration and joint commitment to get affordable capability into the hands of warfighters at the speed of relevance,” added Randy Crites, vice president and general manager at Lockheed Martin Advanced Programs. “This compact ramjet applies Lockheed Martin’s expertise in ramjet inlets and offers extended range at extreme speeds.”
Timeline for 2026 Maturation
Following the successful direct-connect tests, which simulated initial ignition and steady cruise at high altitudes, the companies intend to continue technology maturation throughout the remainder of 2026. Future milestones will focus on expanding the tested operating envelope and refining component durability. The ultimate objective is to integrate the RDR propulsion concept into notional missile configurations for Department of Defense (DoD) programs seeking high-volume, low-cost hypersonic strike capabilities.