What does it take to make a country join the rarefied ranks of orbital launch providers? For Australia, the answer came in a cloud of smoke and an agonizingly brief, hard-fought 14 seconds of airtime. On July 29, 2025, Gilmour Space’s Eris rocket Australia’s first locally designed and made orbital launch vehicle roared off the Bowen Orbital Spaceport in North Queensland, only to fail and crash a few moments later. But in those few seconds, the nation’s space industry made a quantum leap, revealing both the promise and danger of independent launch capability.
The test flight of the Eris rocket commenced with the firing of all four Sirius hybrid engines, which burned for a combined 23 seconds. A video recorded the craft struggling to leave the pad, sliding sideways as it ran out of thrust, before crashing back down to Earth in a fiery but controlled accident. “Today, Eris became the first #AustralianMade orbital rocket to launch from Australian soil ~14s of flight, 23s engine burn. Big step for launch capability. Team safe, data in hand, eyes on TestFlight 2,” Gilmour Space said in a statement, highlighting the importance of the achievement even as the result was bad for the nation’s launch sector.
A technical analysis of the failure attributes to a chain of engine anomalies. Each of the Sirius engines built in-house is a hybrid rocket motor consisting of a 3D-printed solid fuel grain and liquid hydrogen peroxide oxidizer. Nominal thrust from the four-engine cluster yields a thrust-to-weight ratio of 1.5 during liftoff. The loss of one engine shortly after launch lowered this ratio to 1.2, just above what was required for ascent. A second engine failure indicated by white gases leaking from the rear and another loss of altitude brought the ratio under one, dooming the rocket. Interestingly enough, the Sirius engines are not gimballed for thrust vector control; Eris uses reaction control thrusters for attitude control instead, a design feature that could have exacerbated the challenge of keeping things stable during the anomaly according to post-flight technical reviews.
The structural integrity of the vehicle maintained through most of the descent, with the rocket remaining vertical until it expired. The lack of a fireball upon impact is due to the hybrid nature of the first two stages liquid oxidizer and solid fuel that reduced the risk of explosive rupture. The third phase, driven by a Phoenix kerosene- and liquid-oxygen-burning liquid engine, probably was responsible for the isolated fire seen following the vehicle’s tipping over as detailed in technical debriefs.
Eris is 25 meters high with a 2-meter diameter and a launch weight of about 33,000 kg. Its three-stage design is optimized for the growing small satellite market, capable of delivering as much as 215 kg to a 500 km Sun-synchronous orbit or 305 kg to low-inclination equatorial orbits. The first and second stages utilize the Sirius hybrid engines, with the third stage’s Phoenix engine making the final orbital injection. This blended strategy, merging additive manufacturing of fuel grains with in-house engine design, is meant to optimize cost, safety, and performance a philosophy growing among new space launch companies within the world smallsat market.
The test flight was the result of years of development, regulatory compliance, and relentless delays. Gilmour Space, established in 2012 with an operational base on Australia’s Gold Coast, raised $36 million in funding in early 2024 and received its launch approval from the Australian Space Agency in November of that year. Launchway after launchway was blocked again and again: a tropical cyclone in March, an electrical spike that caused the premature release of the payload fairing in May, and steady-on-onnegative weather during June and July. Every failure was greeted with quick technical reaction replacement fairings were shipped out, launch operations optimized evidencing the iterative, data-driven process typical of contemporary launch startups as exhibited by SpaceX and Rocket Lab.
Geographic advantages for Australia are considerable. The Bowen Orbital Spaceport, Australia’s first licensed commercial orbital launch site, provides immediate access to Sun-synchronous and low-inclination orbits over huge, uninhabited expanses perfect for keeping risk to inhabited regions at a minimum. “Only six countries in the world are launching regularly to space using their own technology, and Australia could soon join their ranks,” said Adam Gilmour, co-founder and chief executive. The spaceport’s collaboration with the Juru traditional custodians and its location near Abbot Point reflect a focus on both community and operational excellence in the company’s announcements.
Eris joins a crowded field of veteran small-lift vehicles like Rocket Lab’s Electron, Firefly Alpha, and Astra’s Rocket 3. Although Electron has an established flight history and sophisticated features like carbon composite construction and electric pump-fed engines, Eris separates itself with hybrid propulsion and an all-Australian supply chain. The flexible payload configurations of the vehicle dedicated, rideshare, and multi-manifest position it to support both commercial and defense markets, such as Australia’s Department of Defence and foreign satellite operators with signed launch contracts.
In spite of the brief commercial premiere, the technical and operational insights derived from the initial flight of Eris are already informing its next iteration. A second vehicle is being built with design enhancements based on the maiden flight’s telemetry and failure analysis. Gilmour Space plans to fly back to the pad in six to eight months, an aggressive schedule showing both urgency and optimism. “SpaceX, Rocket Lab and others needed multiple test flights to reach orbit. We’ve learned a tremendous amount that will go directly into improving our next vehicle, which is already in production,” stated Adam Gilmour.
Australia’s maiden orbital rocket can have crashed, but in the harsh mathematics of rocketry, every failure is a stepping stone to success. The combination of hybrid propulsion, additive manufacturing, and indigenous infrastructure that comprises the Eris program heralds a new beginning for Australian space technology a one characterized not by the shortness of flight, but by determination to attempt again.
