VALORH2 was completed in the first half of 2025 with the closure of the design, manufacture and testing of a type IV hydrogen gas tank at 350 bar, thereby verifying the technical feasibility of manufacturing liners by rotational molding and carbon fiber wrapping at our facilities. Several tanks were manufactured, contributing to the definition of a more efficient procedure and the study of variations in the process. Additionally, a rack demonstrator was completed, integrating several fuel cells into an application for hydrogen-powered buses.

The Company has assumed the technical coordination of this project, aimed at researching advanced technologies for the efficient and safe storage of liquid hydrogen, contributing to the technological challenges associated with the decarbonization of the aeronautical sector and the transition towards sustainable energy systems.

The project is being developed in collaboration with the technology partners CellMat, Hiperbaric and AMTEC.

The Aciturri team has led the development of the demonstrator for a cryogenic tank, whose objective is to mature innovative solutions for liquid hydrogen storage through the design, manufacture, integration and experimental validation of a representative system. Within the context of the project, the Company has mainly participated in:

• Development of the demonstrator for the liquid hydrogen storage cryogenic tank: design, manufacture and testing, and technical coordination of the consortium.
• Development of thermo-fluid simulation models to analyze the thermal behavior of the system and optimize its design.
• Research into advanced leak detection and structural monitoring solutions under cryogenic conditions.
• Collaboration in the analysis of the technical-economic feasibility and industrial scalability of the solutions developed.

The MULTIGLIDE project ended this year with the manufacture of a multi-spar box demonstrator co-cured in a single curing cycle, obtaining a highly integrated structure that avoids the assembly process for its integration, as well as the use of mechanical joints, reducing the weight and cost of the overall component, improving aerodynamic efficiency and reducing fuel consumption and, consequently, greenhouse gas emissions.

On the other hand, a structural component test was carried out, making it possible to correlate the structural simulation with the physical behavior of the component.

In addition, the Glide forming process has been applied to structures with high curvature both in plane and out of plane, to automate the preform manufacturing process.

In OVERLEAF, the manufacturing operations corresponding to the design closed in the previous year for a liquid hydrogen tank demonstrator have been completed. During this year, the assembly of the inner tank was carried out at Aciturri’s facilities. This activity made it possible to verify the feasibility of the defined design. The project concluded in October 2025.

In 2025, this project, focused on the development of a thermoplastic aileron solution and on different manufacturing technologies for this type of material, was completed.

In the project’s main line, the manufacture of the highly integrated thermoplastic aileron demonstrator was completed. This involved in-situ consolidation technologies for both skins, stamping for the ribs and Continuous Compression Molding for the spar.

Regarding recycling activity, it was possible to manufacture a thermoplastic panel from the remnants obtained from the manufacture of the ribs. This panel was mechanically tested to assess the mechanical properties obtained and compare them with the reference.

During this final year of activity, composite tooling was also designed and manufactured to demonstrate the feasibility of using this type of tooling.

LIDER concluded in September 2025. The activities carried out consisted of the development of wing structures and fuselage and tail fairings, with highly complex composite components, for current and future helicopters, from the detailed design phase through to the manufacture of demonstrators, some of them intended for ground and flight tests.

The manufacture of the composite material elementary parts was carried out at Aciturri’s plants in Tecnobahía, Seville and Tres Cantos. The static test was successfully completed, managed by Airbus Helicopters.

FASTERH2 concluded its activities in December 2025. The activities carried out consisted of the development of advanced manufacturing technologies for the fuselage/empennage, with high integration of elements to reduce production waste and optimize the use of material and energy. In 2025, activity focused on the manufacture of the different demonstrators. These were carried out at Aciturri’s plants in Seville: sandwich structures using dry fiber and infusion (LRI) technology with a resin containing “BIO” components and, together with external collaborators, the manufacture of stiffeners through the stamping process with thermoplastic material (recyclable); and in Tres Cantos: a fitting using dry fiber and infusion (RTM) technology, together with collaborators, with a resin containing “BIO” components.

The TIANA project concluded in mid-2025, with activities focused on the development of advanced manufacturing technologies based on high integration and automation. All this focused-on cost reduction and enabling high production rates. In 2025, the manufacture of demonstrators was completed with a focus on fairings and primary fuselage structure.

The manufacture of the different demonstrators was carried out at two Aciturri locations. In Seville: sandwich structures applicable to the ventral fairing using dry fiber and infusion technology, and very high-curvature frames corresponding to the rear fuselage section; and in Boecillo: high-load frames corresponding to the rear fuselage section in the structural attachment area with the empennage.

The project to develop a fairing for small launchers completed its R&D phase in 2025, with the manufacture of an engineering model and the performance of functional tests (opening) and static tests corresponding to this phase.

The manufacture of the composite material elementary parts was carried out at Aciturri’s Tecnobahía plant and final integration at the Puerto Real plant. Both functional and static tests were successfully completed at the Aeronautical Technologies Centre (Miñano, Álava).

After this R&D phase, the component has entered its Product Development phase, in which its qualification will be completed.

The project to develop an interstage ring for small launchers completed its R&D phase in 2025, with the manufacture of an engineering model.

The manufacture of the composite material elementary parts was carried out at Aciturri’s Tecnobahía plant and final integration at the Puerto Real plant.

The THESA project proposes the development of a zero-emission aircraft, addressing the technological challenge of decarbonizing the aviation sector. Aciturri has led the project, whose specific objective is to mature the technologies required to develop a powerplant based on a hydrogen fuel cell integrated into a test aircraft.

Aciturri has participated in four areas: collaborating in the modification of the test aircraft selected as the test bench; leading the pressurized hydrogen tank integrated into the aircraft fuselage; researching additive manufacturing technologies with metallic materials for application in air intakes; and, finally, collaborating in research into the development of battery housings in composite materials.