Image: GE Aerospace
GE Aerospace and Lockheed Martin have completed ground tests of a rotating detonation ramjet engine designed for hypersonic missiles. The breakthrough marks the first collaborative project under a broader technology partnership between the two defense giants.
The liquid-fueled propulsion system promises to propel missiles at hypersonic speeds—exceeding Mach 5—while extending range and reducing production costs compared to conventional ramjet designs, according to the companies.
Efficiency Through Innovation
The rotating detonation ramjet combusts fuel and air using detonation waves rather than traditional combustion methods. This approach delivers several operational advantages for military applications.
The engine’s compact architecture allows missiles to carry more fuel or larger payloads. Smaller physical dimensions also lower manufacturing costs while maintaining high performance standards.
Enhanced fuel efficiency translates directly into extended range capabilities. The system generates thrust sufficient for both supersonic and hypersonic flight profiles, enabling engagement of time-sensitive targets at extreme distances.
Engineers achieved another critical milestone: the ramjet ignites at lower speeds than conventional designs. This breakthrough means smaller, less expensive boosters can launch missiles to operational velocity.
Technical Validation
Testing took place at GE Aerospace’s Research Center in Niskayuna, New York. Engineers conducted direct connect trials simulating ramjet ignition sequences and sustained cruise conditions across multiple flight scenarios.
The test regimen included challenging high-altitude operations where thin atmospheric conditions complicate stable combustion. Technicians injected air into Lockheed Martin’s tactical inlet to replicate supersonic flight at varying speeds and altitudes.
“The testing on the rotating detonation ramjet and inlet exceeded expectations,” said Mark Rettig, vice president at GE Aerospace’s Edison Works Advanced Programs. “We are excited about this collaboration to continue maturing our advanced air-breathing hypersonic propulsion technologies.”
The ramjet integrates GE Aerospace’s rotating detonation combustion system with Lockheed Martin’s inlet design. The inlet channels high-speed airflow efficiently to the combustor, maintaining performance throughout the flight envelope.
Strategic Imperative
Randy Crites, vice president at Lockheed Martin Advanced Programs, emphasized the system’s operational relevance. “This compact ramjet applies Lockheed Martin’s expertise in ramjet inlets and offers extended range at extreme speeds,” he stated.
Crites described the demonstration as proof of collaborative innovation’s power. “We’re committed to delivering a propulsion system that advances America’s hypersonic capability in an intensifying threat environment,” he added.
The project follows two years of internal investment by both companies before formal testing began. Both firms positioned the technology as essential for maintaining military advantages as peer competitors advance their own hypersonic programs.
Development Timeline
GE Aerospace and Lockheed Martin plan to continue ramjet maturation efforts throughout 2026. The companies did not specify timelines for prototype flight testing or production contracts.
The rotating detonation engine represents a significant departure from scramjet designs that other defense contractors have pursued for hypersonic applications. While scramjets eliminate moving parts entirely, rotating detonation systems promise greater fuel efficiency and operational flexibility across wider speed ranges.
The successful ground tests position both companies to compete for future Pentagon hypersonic weapon programs as the Department of Defense prioritizes rapid development of long-range strike capabilities.
Source: GE Aerospace Press Release
