European Space Agency selects Sener to contribute to grid fin technologies for Themis reusable rocket project

European Space Agency selects Sener to contribute to grid fin technologies for Themis reusable rocket project

(IN BRIEF) Sener has secured a role in the European Space Agency’s Themis program, a joint effort with ArianeGroup to develop a reusable rocket demonstrator capable of vertical landing and relaunch. The company’s teams in Poland and Spain will provide critical components for the rocket’s grid fin system, including mechanisms for deployment, actuation, and aerodynamic control needed for safe landings. The project, one of ESA’s most ambitious, is seen as a strategic milestone in Europe’s pursuit of independent, cost-competitive access to space. Sener’s participation highlights its expertise in aerospace engineering and its contribution to shaping the future of reusable launch systems.

(PRESS RELEASE) MADRID, 11-Sep-2025 — /EuropaWire/ — Sener has been awarded a contract within the European Space Agency’s (ESA) Themis program, developed in cooperation with Ariane Group, which focuses on building a demonstrator for a reusable rocket capable of vertical landing and relaunch. The program is considered one of ESA’s most ambitious initiatives and plays a pivotal role in strengthening Europe’s strategic autonomy in space access.

The Themis project is designed to test and validate critical technologies for reusable rockets, enabling them to be trialed in real-world conditions before deployment in operational launch systems. Such demonstrators help minimize risks and shorten the timeline for developing competitive, cost-effective space launch solutions.

As part of its contribution, Sener’s engineering team in Poland will design and manufacture two vital components of the grid fin system: the GFAM (Grid Fin Assembly Mechanism), which acts as the key structural interface, and the LLD-D device, which allows the fins to be locked or unlocked after deployment. These parts will undergo rigorous testing within the qualification model phase.

In parallel, Sener’s Spanish division is responsible for developing the GFAD (Grid Fin Actuation Device), a linear actuator that transfers motion to the GFAM produced in Poland. Together, GFAM and GFAD are critical components of the Grid Fin System (GFS), which ensures precise aerodynamic control for the safe vertical landing of Themis’ first stage.

“Participation in the Themis project underscores our expertise in advanced aerospace technologies,” said Jakub Pierzchała, General Manager of Sener in Poland. “Our contributions will be integrated into a system that is central to Europe’s ambitions in reusable launch technology. We are proud to play a role in such a transformative initiative.”

Themis demonstrates Europe’s determination to remain competitive with global leaders in reusable space launch technology. If successful, it is expected to reduce launch costs, improve sustainability, and enhance Europe’s standing in the international space sector.

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Media Contact:

Tel: +34 918 077 000

SOURCE: SENER group