The fLHYing tank program comprises three primary aspects:

• Define requirements for the development of a 1,000-liters cylindrical vacuum-insulated composite liquid hydrogen storage system with peripherals and instrumentation for flight testing
• Design, manufacture and test at component/subsystem level a liquid hydrogen storage system with peripherals and instrumentation for flight testing
• Develop and validate a thermo-fluid-structural digital twin of the developed liquid hydrogen storage system integrated in the Pipistrel Nuuva V300 unmanned cargo platform.

The main ambition of the fLHYing tank project is to disruptively increase the Technology Readiness Level and know-how of liquid hydrogen storage systems for aircraft via flight-testing of the fLHYing tank in the Pipistrel Nuuva V300 cargo UAV. As the main outcome, the flight test data will be thoroughly analysed at the end of the project and rigorously documented for use of the new knowledge in Phase 2 of the Clean Aviation Programme. The fLHYing tank project will positively impact the aeronautical industry via rapid knowledge acquisition and de-risking of groundbreaking technologies, enabling reductions in the time-to-market and R&D costs, leading to accelerated hydrogen-powered regional, short-range, and short-medium range aircraft Entry-Into-Service (EIS).