Air Force Launched Program for Detonation Engine Tech
The HERMES initiative seeks to mature rotating detonation rocket engines to enable more affordable, high-speed weapons.
Updated on Oct. 2, 2026 in Space
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The Air Force Research Laboratory has initiated the HERMES program to advance rotating detonation rocket engine technology from TRL 3 to TRL 6. This research-stage development aims to enable the production of longer-range air-to-surface and air-to-air weapons.
Why it matters
The program seeks to develop high-speed weapons optimized for large-scale production by leveraging compact engine architectures. This design allows for increased fuel or payload volume within existing missile dimensions.
The engine operates using detonation waves that circulate through an annular combustion chamber at speeds exceeding 2 kilometers per second. This process aims to convert propellant energy into thrust more efficiently than traditional combustion cycles.
The players
Air Force Research Laboratory
The primary scientific research organization for the United States Air Force focused on developing advanced aerospace technologies.
The details
Rotating detonation rocket engines rely on continuous detonation waves traveling around an annular, or ring-shaped, chamber. This geometry facilitates efficient energy conversion by bypassing the slower deflagration processes found in conventional rockets. The HERMES program plans to integrate this technology into a vehicle launched from the ground and accelerated by a sounding rocket to test real-world flight capabilities.
Timeline
January 2026: The Air Force conducted a live-warhead ERAM test.
October 1, 2026: The Air Force Research Laboratory published the HERMES solicitation.
36 to 48 months: The expected total duration for the current development program.
The Tech Race
The HERMES program follows technical milestones established by previous initiatives like the ERAM program. It marks a shift from component testing toward integrated flight demonstrations for high-speed kinetic munitions.
This development is currently in the research phase and does not have a timeline for operational deployment in defense systems. Its success will dictate the manufacturing and design requirements for future high-speed missile platforms used by the U.S. military.
The takeaway
The program aims to transition detonation engines from laboratory environments to flight-ready status within four years. Watch for upcoming ground-launched flight demonstration results to confirm if the technology meets performance goals for large-scale production.
Further reading
For additional context on advancements in propulsion and launch hardware, visit Space.
Source note: This article includes information reported by Army Recognition.
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