Infinite Aerospace's self-developed space bus IH-1 flight-configuration propulsion system aces ground hot-fire test | Unity Ventures portfolio

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A key technological breakthrough in reusable space transportation has been achieved, and the system has entered the final countdown to its maiden flight.

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Unity Ventures portfolio company Infinite Aerospace has successfully completed ground hot-fire testing of the IH-1 "Space Bus" flight-configuration propulsion system, achieving a key technical breakthrough in reusable space transportation.

Infinite Aerospace is dedicated to providing commercial on-orbit services. Its independently developed orbital vehicle enables rapid, precise multi-satellite deployment, with planned business areas including orbital life extension, space transportation, and payload hosting. The company also offers technical development and product manufacturing services for monopropellant and bipropellant liquid attitude control propulsion systems, cold-gas attitude control systems, and engine units and components for rockets, satellites, spacecraft, space stations, and deep-space probes — delivering high-reliability, low-cost commercial customization. Infinite Aerospace recently announced the completion of a tens-of-millions-of-yuan angel round led by Unity Ventures.

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In March 2025, Beijing Infinite Aerospace Technology, a Unity Ventures portfolio company, successfully completed ground hot-fire testing of its IH-1 "Space Bus" flight-configuration propulsion system, with all performance metrics meeting on-orbit flight requirements. This marks a critical technical breakthrough in reusable space transportation for the IH-1 Space Bus, putting it into the final countdown to its maiden flight.

As the largest-scale ground test before first flight, it comprehensively evaluated the IH-1 propulsion system's overall performance, component functionality, and coordination characteristics, and fully verified the correctness and operability of critical pre-launch procedures including pressurization and propellant loading.

The test program completely covered actual flight conditions for missions including deep orbital maneuvers, rapid orbital transfer, multiple heterogeneous orbital deployments, and precision docking corrections, while also assessing the propulsion system's ability to operate stably under various extreme conditions. Concurrently, the company achieved small-batch engine production, making clear progress in R&D capability, organizational coordination, and quality and risk management.

Test results demonstrated that the propulsion system exhibits comprehensive performance advantages in long service life, fast response, and high reliability, with technical specifications exceeding mission requirements across the board. The system is capable of long-term on-orbit service in complex space environments and successfully passed multiple repeated start-up verifications under extreme operating conditions, demonstrating exceptional environmental adaptability and mission stability.

As one of the core technologies of the IH-1 Space Bus, this system provides reliable propulsion for critical missions including orbital transfer, on-orbit maneuvering, station-keeping, and high-precision space docking. This breakthrough not only validates the engineering feasibility of reusable space propulsion systems, but also marks significant progress for Infinite Aerospace in space transportation technology, laying a solid technical foundation for building a reusable space transportation system.