Australian rocket startup Gilmour pinpoints cause of first rocket launch failure

Click for video, cued to just before launch. The red
dot marks the launchpad location.
The Australian rocket startup Gilmour Space on April 24, 2026 released the results of its investigation into the launch failure seconds after liftoff of its Eris rocket in July 2025.
Our investigation found that approximately nine seconds after ignition, one of the four first-stage hybrid rocket motors experienced a loss of thrust. A second motor exhibited similar behaviour at around 17 seconds, reducing vehicle performance and bringing the mission to an early end.
Analysis identified two independent failure modes originating from the oxidiser pump subsystem. Electrical and thermal faults were observed in the electric pump motors and associated inverters, including components sourced from an external supplier. We now have a clearer understanding of the underlying causes.
The company hopes to try again later this year, but to do so it will need license approval from Australia’s bureaucracy, and such approvals have not been quick.
Hat tip BtB’s stringer Jay.

Click for video, cued to just before launch. The red
dot marks the launchpad location.
The Australian rocket startup Gilmour Space on April 24, 2026 released the results of its investigation into the launch failure seconds after liftoff of its Eris rocket in July 2025.
Our investigation found that approximately nine seconds after ignition, one of the four first-stage hybrid rocket motors experienced a loss of thrust. A second motor exhibited similar behaviour at around 17 seconds, reducing vehicle performance and bringing the mission to an early end.
Analysis identified two independent failure modes originating from the oxidiser pump subsystem. Electrical and thermal faults were observed in the electric pump motors and associated inverters, including components sourced from an external supplier. We now have a clearer understanding of the underlying causes.
The company hopes to try again later this year, but to do so it will need license approval from Australia’s bureaucracy, and such approvals have not been quick.
Hat tip BtB’s stringer Jay.









