Astrobotic Tests Next-Gen Rotating Detonation Rocket Engine With 300-Second Burn

A new propulsion milestone has been reached as Astrobotic successfully tests its experimental Chakram rotating detonation rocket engine, achieving a record 300-second continuous burn during a campaign at NASA’s Marshall Space Flight Center, a result that signals a turning point for next-generation space propulsion.

A Radical Engine Concept Finally Proves Its Staying Power

The promise of rotating detonation rocket engines (RDREs) has been discussed for decades, yet practical limitations have consistently held the technology back. Unlike conventional engines that rely on steady combustion, RDREs harness a continuous detonation wave that travels in a circular path, generating higher pressure and improved efficiency. This design has long suggested gains in thrust while reducing fuel consumption and overall engine mass, key advantages for space missions where every kilogram matters.

During the recent campaign led by Astrobotic, two Chakram prototypes demonstrated sustained operation across multiple firings, accumulating more than 470 seconds of total runtime. The standout moment came with a continuous 300-second burn, widely considered the longest of its kind. The engine maintained stability throughout the test and showed no visible signs of wear afterward, addressing one of the most persistent concerns surrounding RDRE technology: durability under prolonged operation.

“Chakram more than exceeded our expectations,“ said Bryant Avalos, Astrobotic’s Principal Investigator for Chakram. “Demonstrations like this show how RDRE technology could support a wide range of Astrobotic missions, from propulsion on future lunar landers to in-space orbital transfer vehicles, and other capabilities that will help expand operations throughout cislunar space.”

These results suggest that RDREs are moving beyond experimental bursts and entering a phase where sustained, reliable performance is achievable, opening the door to real mission integration.

Record Performance Signals A Shift Toward Flight Readiness

The test campaign at NASA’s Marshall Space Flight Center in Huntsville, Alabama, marks a significant validation step for RDRE technology. Each Chakram engine generated more than 4,000 pounds of thrust while reaching thermal steady-state conditions, an indicator that the engine can operate continuously without instability or overheating.

This level of performance represents a notable leap from earlier RDRE experiments, which often struggled with maintaining a stable detonation wave over time. Achieving both thrust and stability simultaneously has been one of the field’s most difficult challenges, and Astrobotic’s results point to meaningful progress in overcoming it.

“The 300-second burn was the cherry on top,“ Avalos said.

The ability to sustain such a burn duration without hardware degradation provides engineers with critical data on thermal behavior, structural resilience, and combustion dynamics. These insights are expected to accelerate refinement efforts, particularly in areas such as engine throttling and regenerative cooling.

The study, conducted by Astrobotic with support from NASA programs, highlights how iterative testing and advanced manufacturing techniques are converging to make once-theoretical propulsion systems viable.

From Experimental Technology To Lunar And Orbital Missions

The implications of this breakthrough extend far beyond the test stand. Chakram is being developed with future missions in mind, including integration into upgraded versions of Astrobotic’s Griffin lunar lander and potential use in reusable launch systems and orbital transfer vehicles operating in cislunar space.

One of the enabling factors behind this progress is the use of advanced manufacturing, including tunable porosity metal additive manufacturing. This approach allows engineers to optimize internal structures for improved heat management and combustion stability, two critical aspects for RDRE functionality.

“Demonstrations like this show how RDRE technology could support a wide range of Astrobotic missions, from propulsion on future lunar landers to in-space orbital transfer vehicles, and other capabilities that will help expand operations throughout cislunar space.”

Such versatility positions RDREs as a potential cornerstone technology for future space infrastructure, where efficiency and reusability are increasingly central requirements.

A Competitive Field Moves Closer To Reality

Astrobotic is not alone in pursuing RDRE technology. Other players, including Venus Aerospace, have already conducted flight tests, marking early demonstrations of the concept beyond ground-based experiments. This growing momentum suggests that RDRE development is entering a more competitive and accelerated phase.

The latest results from Chakram add weight to the argument that RDREs could soon transition from experimental systems to operational engines. As engineers continue refining performance parameters and reducing system mass, the technology edges closer to deployment in real missions.

What once existed primarily in theoretical studies is now being validated through sustained testing, bringing a new class of propulsion systems into focus. If current progress continues, RDREs may soon play a defining role in how spacecraft travel between Earth, the Moon, and beyond.

Enjoyed this article? Subscribe to our free newsletter for engaging stories, exclusive content, and the latest news.