#Switzerland #Hybrid-Electric #RTX #Sion #H55 Battery

H55's Battery Technology Advances RTX Hybrid-Electric Flight Demonstrator

In a significant leap toward sustainable aviation, H55, a Swiss company specializing in electric propulsion, has reported substantial advancements in developing the 200 kWh Energy Storage System (ESS) for the RTX Hybrid-Electric Flight Demonstrator. This project aims to showcase an impressive enhancement in fuel efficiency—up to 30%—for regional aircraft using a pioneering hybrid-electric propulsion system. The demonstrator integrates an advanced thermal engine alongside a powerful 1-megawatt electric motor, supplemented by H55's state-of-the-art battery technology, creating an innovative propulsion architecture designed for the future of aviation.

Recent Milestones and Achievements

Since achieving a key milestone with the first full-power system test in June 2025, H55's ESS has rapidly progressed toward certification standards essential for the aviation sector. The robust partnership with Pratt & Whitney Canada, which leads the RTX project, underscores the significance of H55's role in this endeavor. According to Rob Solomon, CEO of H55, the distinction of being selected as a certification foundation for Pratt & Whitney Canada reflects not only the reliability of their battery technology but also H55's commitment to ensuring safety and compliance through extensive testing.

H55's Energy Storage System has undergone thorough validation processes, accumulating over 2,000 flying hours without any reported incidents. This track record instills confidence that their technology can meet the rigorous requirements set forth by the European Union Aviation Safety Agency (EASA). The lightweight and modular design of the system provides adaptable integration for varying aircraft models, thus enhancing its potential for widespread application in aviation.

H55's Vision for Electric Aviation

With its roots tracing back to the pioneering Solar Impulse project—which demonstrated electric propulsion's viability for long-duration flights—H55 is redefining electric aviation. The company has amassed invaluable operational experience, having developed and flown several electric aircraft platforms.

Sébastien Demont, CTO and Co-Founder of H55, emphasized that this integration milestone signifies a transformative chapter not just for H55 but for the wider electric aviation industry. The certification groundwork laid down for CS23 aircraft is now being successfully scaled to cater to the requirements of CS25 hybrid-electric demonstrators, indicating a significant technological progression.

The RTX demonstrator is currently progressing toward aircraft integration and flight testing on a modified De Havilland Canada Dash 8-100. This ambitious project marks an essential step in validating hybrid-electric propulsion within regional aviation, allowing for real-world data collection in a representative environment.

Expanding Market Opportunities

As the aviation sector evaluates hybrid-electric propulsion options to mitigate fuel costs and environmental impact, scaling battery systems capable of meeting aviation certification requirements becomes critical. With manufacturers actively exploring innovative solutions for next-generation regional aircraft, H55's technology stands ready to meet this challenge.

Rob Solomon noted that initiatives like these demonstrate the efficacy of their certifiable battery systems developed for smaller aircraft, now adaptable for the regional market. The transition signals a major stride toward unlocking the commercial potential of electric aviation, setting the stage for long-term opportunities for certified propulsion technology providers.

In summary, H55's advancements in battery technology and their strategic collaboration with leading aerospace entities underscore the realism of hybrid-electric aircraft entering the mainstream aviation market. As this technology matures, it is poised to play a vital role in creating more efficient and environmentally friendly aviation solutions, thereby shaping the future of air travel.

About H55

Founded to honor the technological legacy of the Solar Impulse project, H55 focuses on crafting certified electric propulsion systems and energy storage solutions for aviation. The company has dedicated itself to ensuring that lithium cells meet stringent aviation standards, encompassing rigorous testing and safety measures. With over two decades of expertise in electric aviation, H55 is paving the way for the next generation of flight, bridging the gap between innovative technology and practical application in the aviation industry.