Pittsburgh, PA – In what can only be described as successfully taming a continuous, controlled, supersonic explosion, Astrobotic has announced a landmark breakthrough in rocket propulsion. The company has successfully put its Chakram rotating detonation rocket engine (RDRE) through its paces at NASA’s Marshall Space Flight Center, where it clocked over 4,000 pounds of thrust and, far more impressively, sustained a continuous 300-second burn. This five-minute “hot fire” is believed to be the longest duration ever achieved for an RDRE—a technology that has long been the darling of propulsion theorists but a recurring nightmare for practical engineers.
The test campaign, conducted in Huntsville, Alabama, saw two Chakram prototypes endure eight grueling hot-fire tests, racking up over 470 seconds of total runtime without the hardware showing any discernible signs of wear and tear. Unlike conventional rocket engines that rely on a steady, deflagrative burn, RDREs utilise supersonic detonation waves that race continuously around a ring-shaped chamber. It is a method that is, in theory, significantly more efficient, promising to squeeze more thrust out of every drop of fuel—a vital advantage when every single gramme of weight is a costly burden in spaceflight.
Astrobotic’s team reported that the engine performed “even better than expected,” reaching a stable thermal steady state during its record-breaking burn. This result is a massive leap toward proving that RDREs can be reliable enough for real-world missions, shifting the tech from the realm of radical science projects into the category of viable, flight-ready hardware. The company now claims Chakram is among the most powerful RDREs ever demonstrated.
Why does this matter?
A successful, long-duration RDRE test isn’t just a bit of technical wizardry; it represents a potential paradigm shift for spacecraft design. The leap in efficiency—potentially offering up to 15% better specific impulse—combined with a more compact engine footprint could allow future spacecraft to haul heavier payloads or venture further into the void with less propellant. Astrobotic plans to bake this technology into its future Griffin-class lunar landers, as well as its Xodiac and Xogdor-class reusable rockets. For a company that recently navigated a high-profile, if ultimately frustrating, lunar mission, proving out next-generation tech with such clinical precision is a bold statement of intent. It sends a clear signal: while reaching the Moon remains notoriously difficult, Astrobotic is dead set on building the sophisticated, high-efficiency hardware required for a permanent presence in cislunar space.