Overview
- Isar Aerospace canceled the planned launch on Monday, June 15 after telemetry showed deviations in Spectrum's fluid systems and the company said teams are analyzing the new data to find the cause.
- This was the fourth postponement or abort of the rocket's second test flight following earlier January, March and April setbacks that included a suspected pressure‑tank leak and a fishing boat entering the safety zone.
- The mission, called 'Onward and Upward,' carried five small satellites and a university experiment and was meant to validate critical systems under flight conditions for a vehicle designed to lift about one tonne to low Earth orbit.
- Isar remains well funded and growing, having raised about €270 million, planning factories in the Munich region to scale production toward roughly 40 rockets a year, and reporting an order book into 2028.
- The repeated delays highlight the technical risks in propellant and pressure systems for LOX‑propane vehicles and could slow Europe's push for an independent small‑launch sector while increasing commercial pressure on Isar to prove repeatable reliability.