Roughly two years after it opened its doors, a Xi’an commercial startup called Mega Engine Technology has announced that a single high-pressure oxygen-rich staged-combustion kerolox engine accumulated 1,000 seconds of run time at rated conditions across its test campaign — the kind of endurance number that until now belonged almost exclusively to engines designed inside China’s state propulsion houses.
The company disclosed the results in a Chinese social media post on May 25, 2026, according to SpaceNews, describing the engine — called Chi, which translates roughly as “blazing” — as having demonstrated rapid startup, stable operation, and intact hardware on post-test inspection. Total program test accumulation across all firings has reached 2,000 seconds.
The performance figures place Chi squarely in the class of engines that matter for reusable medium-lift launchers. Sea-level thrust is reportedly throttleable between 35 and 75 tons, rising to 87 tons in vacuum. Sea-level specific impulse is rated at 302 seconds, climbing to 350 seconds at altitude.
Why Oxygen-Rich Staged Combustion Matters
Staged combustion is hard. The cycle pre-burns a portion of the propellants in a small chamber to drive the turbopump, then injects that hot, oxygen-rich gas into the main combustion chamber where the rest of the fuel completes the burn. The result is higher chamber pressure and meaningfully better specific impulse than the open-cycle gas-generator engines most commercial startups have built.
The catch is metallurgy. Hot, oxygen-rich gas running through turbine blades and manifolds at high pressure tends to set metal on fire. Soviet engineers cracked the problem first — Valentin Glushko’s KB Energomash flew the oxygen-rich staged-combustion RD-253 on Proton in 1965, and the much larger RD-170 family followed in the 1980s. Outside Russia, only a handful of programs have replicated it. Europe’s ESA staged-combustion demonstrator ran at sub-scale at the DLR Lampoldshausen facility, and Germany’s Rocket Factory Augsburg fired the first full-scale commercial European staged-combustion engine in 2021 — both methalox, both still pre-flight.
In China, the technology has lived almost entirely inside the Academy of Aerospace Liquid Propulsion Technology (AALPT), the CASC institute in Xi’an that developed the oxygen-rich staged-combustion YF-100 engine now flying on the Long March 5, 6, 7, and 8 families. AALPT’s commercial offering for private launchers is the open-cycle YF-102 — lower chamber pressure, lower specific impulse, but easier to build, and currently flying on Space Pioneer’s Tianlong-2 and CAS Space’s Kinetica-2.
Chi, if its test data hold up under flight conditions, would give Chinese commercial launchers access to staged-combustion performance without going through the state propulsion house.
A Company That Appeared Almost Overnight
Mega Engine began operations in early 2024. According to a 2025 conference summary cited by SpaceNews, co-founder Zhang Chenxing — who holds a PhD from MIT — told attendees at an April 2025 industry event that the company had completed development and partial testing of its first staged-combustion engine. Roughly a year later, it is logging 1,000-second accumulated runs on a single test article.
That timeline is striking. Building a working oxygen-rich staged-combustion engine from a blank sheet typically takes a decade or more. Mega Engine appears to have done it in under two years.
The company itself offers only that the core team is a group of experts focused on the development of advanced liquid rocket engines. The founding team almost certainly carries direct experience from AALPT or related state institutes in Xi’an. The geography alone is suggestive. So is the technical maturity.
Civil-Military Fusion as Industrial Policy
The pattern is not an accident. Beijing has spent the better part of a decade pushing expertise, intellectual property, and personnel out of state defense-industrial institutions into nominally private commercial ventures. The official term is civil-military fusion, and propulsion is one of its clearest test cases.
The contrast with the American approach is sharp. As one defense investor argued in War on the Rocks, U.S. startups working on security-relevant technology are typically encouraged to build commercial applications first and adapt for defense later — a sequence that can add five to ten years before a capability reaches the Pentagon. China’s system does not impose that delay. Whether one views fusion as efficient or coercive, it compresses the path from state lab to flight hardware.
Mega Engine fits that template precisely. State-trained engineers, state-developed technology base, private capital structure, commercial customer list.
The 200-Ton Engine and What It Implies
Chi is not the endpoint. The company has stated it aims to unveil a second engine, called Yan, later in 2026 — a 200-ton-class closed-cycle kerolox engine intended for heavy-lift applications. Together, Chi and Yan are pitched as a complete reusable LOX/kerosene family covering small upper stages through large first stages.
A 200-ton kerolox staged-combustion engine would represent a significant capability advance for China’s commercial sector. If Yan flies on schedule, China’s commercial sector will have a domestically produced, reusable, high-performance kerolox engine outside the state monopoly for the first time.
Mega Engine describes high-pressure closed-cycle engines as the “deep water zone” of commercial liquid propulsion. Most Chinese private launch companies — Landspace, Jiuzhou Yunjian, iSpace — have built methalox engines instead, which are easier to develop and offer reusability benefits but lower density-specific impulse.
The Megaconstellation Pull
The market context explains the urgency. China has committed to megaconstellation programs — including Guowang and Qianfan — aiming for tens of thousands of satellites. Beijing is also studying orbital data centers. None of it is feasible at China’s current launch cadence.
The state-owned launch sector cannot scale fast enough on its own. That is why Beijing has tolerated and actively supported a commercial launch sector that competes, at the margins, with CASC’s own rockets. Engine supply is the bottleneck. A private vendor capable of delivering staged-combustion kerolox engines in volume would be valuable to nearly every commercial launch company chasing constellation contracts.
What Remains Unverified
The Mega Engine claims rest entirely on company-issued statements and social media posts. Independent verification of the throttle range and specific impulse figures is not yet available, and the company has not yet announced a launch vehicle customer or a flight date for Chi.
Several questions matter for assessing how seriously to take the program. First, what was the longest single firing in the 1,000-second campaign, and did it run at full rated chamber pressure or at a derated condition? The statement indicates the campaign was conducted at rated conditions, but provides no telemetry data. Second, the company has not disclosed whether the test article was a flight-configuration engine or a development unit with simplified components. Third, the supply chain for high-grade alloys and turbopump bearings — the parts that fail first in oxygen-rich environments — has not been described.
Mega Engine’s claims rest on a single weekend’s social media post. The trajectory looks credible; the verification does not yet exist.
The Broader Signal
Whether or not Chi flies on schedule, the appearance of a credible private oxygen-rich staged-combustion program in China is a real data point. The technology gap between Chinese state and commercial propulsion is narrowing fast, and the mechanism doing the narrowing is deliberate state policy moving engineers and know-how across an institutional boundary that, in other countries, would be far harder to cross.
Mega Engine tests its engines in Xi’an, the same city that houses the AALPT institutes whose engineers built the YF-100 family flying today on every modern Long March. The test stands echo into the same Shaanxi evenings. The smoke from Chi has cleared. The smoke from Yan, if the company fires it on schedule this year, will say whether the closed propulsion club has truly opened — or whether a single startup just got close enough to look in.
