AeroDelft Hydrogen Aircraft Completes RTHA Taxi Tests

The AeroDelft hydrogen aircraft successfully completed its inaugural series of gaseous hydrogen taxi tests at Rotterdam The Hague Airport (RTHA) in May 2026. This operation marks a critical step for the Project Phoenix aircraft, a development program led by students at the Delft University of Technology (TU Delft). By conducting these trials at an operational commercial airfield, the team is gathering empirical data on ground handling, propulsion stability, and safety protocols essential for the future of hydrogen fuel cell aviation.

Advancing the DutcH2 Aviation Hub

The taxi tests represent a primary milestone for the DutcH2 Aviation Hub project, an initiative coordinated by the Rotterdam The Hague Innovation Airport (RHIA). According to Isha Moharir, Team Manager at AeroDelft, the objective of these ground tests is to demonstrate that hydrogen propulsion is functional and safe within the complex environment of an active airport. The Rotterdam The Hague Airport serves as a field laboratory, allowing stakeholders to test the entire hydrogen value chain, including refueling protocols and ground support equipment. This integration is vital for the Delft University of Technology team as they refine the Phoenix platform for future flight.

Technical Evolution of the Phoenix Platform

The current testing phase utilizes gaseous hydrogen, a technology chosen for its maturity. However, the program is designed to transition toward cryogenic liquid hydrogen to improve energy density. The current prototype features a 1.5 kW fuel cell and a 5.7-meter wingspan. In comparison, the planned full-scale version is designed to utilize a 125 kW fuel cell and a 10-meter wingspan, targeting a 400 km range on 6 kg of liquid hydrogen.

Phoenix Prototype vs. Full-Scale Phoenix: Key Specifications

Regulatory and Infrastructure Challenges

The transition to hydrogen-powered flight remains subject to rigorous regulatory oversight. The European Union Aviation Safety Agency (EASA) is currently evaluating existing certification standards to address hydrogen-specific hazards, including fire protection and fuel storage. These efforts are supported by the joint FAA and EASA Hydrogen Technologies Working Group, which aims to harmonize airworthiness requirements. For regulators, these ground tests provide essential data to close existing gaps in safety standards.

While hydrogen holds promise, it faces competition from other decarbonization paths. The EASA European Aviation Environmental Report 2025 suggests that hydrogen propulsion faces significant structural constraints due to the weight of cryogenic storage systems. Furthermore, some industry analysts argue that Sustainable Aviation Fuels (SAF) and direct electrification remain more immediately deployable than the infrastructure-heavy requirements of hydrogen.

What Comes Next for Project Phoenix

The program is currently tracking toward a major flight milestone in 2027, when the team expects to conduct the first liquid hydrogen flight of the full-scale Phoenix aircraft. Before that, the EASA-led Clean Aviation CONCERTO project is expected to complete its hydrogen certification gap analysis by the end of 2026. These milestones will determine how quickly hydrogen-electric propulsion can move from student-led prototypes to commercial-grade applications.

Why This Matters for Airport Operations

For airports like RTHA, the successful integration of hydrogen fuel systems is a prerequisite for long-term sustainability. The involvement of partners like Air Products in these tests provides necessary operational data on the transport and dispensing of aviation-grade hydrogen. As the industry moves toward zero-emission goals, the ability to safely manage these fuels at active commercial hubs will distinguish airports that can support the next generation of aircraft architectures from those that cannot.