Eight hot fires, five continuous minutes, and a budget under $1.5 million. Astrobotic’s detonation engine test matters less as a lab record than as evidence a startup can buy serious propulsion progress cheaply.
A startup just ran an experimental rocket engine for five straight minutes on a budget under $1.5 million. In space hardware, that is the part that should make people pay attention, not the acronym.
Payload Space reported that Astrobotic, the Pittsburgh lunar logistics company, spent less than $1.5 million on the NASA-supported test campaign. During that campaign, Astrobotic said its Chakram engine ran for 300 seconds continuously, produced more than 4,000 pounds of thrust per engine, and logged more than 470 seconds across eight hot-fire tests without visible hardware damage.
Space.com noted that the company framed the result as a record-setting step toward flight hardware. The engine itself is a rotating detonation rocket engine, or RDRE. Instead of burning propellant in the steady way conventional rocket engines do, it drives a supersonic shock wave around a ring-shaped chamber. The appeal is straightforward: more work from the same fuel, with the possibility of smaller and lighter engines. Astrobotic says that could improve specific impulse, a measure of fuel efficiency in rockets, by as much as 15% while also improving thrust-to-weight ratio and packaging. That number comes from the company, not an independent flight program.
What Astrobotic appears to have shown is that a small company can push the technology forward at startup-scale cost. NASA, defense primes, and Japanese space agency JAXA have all worked on RDREs for years. NASA's own January 2023 full-scale RDRE test reached about 4,000 pounds of thrust. A December 2023 NASA test reached more than 5,800 pounds for 251 seconds. Astrobotic's 300-second burn now appears to be the duration record.
That matters because the company is not building a science project. Astrobotic says it plans to use Chakram on its Griffin lunar lander, two reusable suborbital rockets called Xodiac and Xogdar, and a future orbital transfer vehicle, according to Payload Space. SpaceNews reported that Griffin is now slated for no earlier than July 2026, and that Astrobotic won $17.5 million in NASA and military contracts in December to develop three reusable suborbital vehicles.
NASA also helped fund the engine work directly. Astrobotic said Chakram was supported by two Small Business Innovation Research contracts and a Space Act Agreement with NASA's Marshall Space Flight Center, where the latest tests ran.
The caveat is not subtle. Rocket propulsion is full of test-stand miracles that never become flight hardware. JAXA flew an RDRE in space in 2021, but at a much smaller scale: Wikipedia's source trail says it produced about 116 pounds of thrust on a sounding rocket second stage. Astrobotic also has its own credibility problem. Gizmodo reported that the company's Peregrine lunar mission in 2024 failed after a propulsion-system anomaly.
So the uncomfortable version is this: Astrobotic may have found a cheaper way to get serious detonation-engine data, but it still has to prove it can turn that data into a vehicle that survives contact with space. Five minutes on a stand is real progress. A lunar descent burn is a different exam.