Hydroplane, based in Lancaster, California, has made significant strides in advancing hydrogen-powered rotorcraft flight. The company successfully demonstrated full rotor flight speed on its hydrogen fuel cell powered rotor transmission test stand, showcasing progress towards realizing hydrogen-powered rotorcraft flight. Hydroplane's hydrogen fuel cell powerplant is specifically engineered to replace internal combustion engines across certified, experimental, and next-generation aircraft, as well as auxiliary power units. The company's collaborations with the U.S. military, including the U.S. Army and previous contracts with the U.S. Navy and Air Force, demonstrate its commitment to innovation in sustainable aviation. Dr. Anita Sengupta, the CEO of Hydroplane, emphasized the importance of validating the performance and mission relevance of their lightweight hydrogen fuel cell powerplant for vertical lift and extended-range UAV/UAS operations. This validation included integrating their electric propulsion system with a rotor transmission and a 23-foot rotor, achieving stable operation at flight-representative rotor speeds. Hydroplane's achievements reflect a broader industry trend towards exploring hydrogen as a viable alternative in aviation, with a focus on lightweight and efficient systems for future aircraft operations.