Tests of a liquid hydrogen fuel system by MTU Aero Engines validate that a defined mass flow of preconditioned hydrogen can be fed safely into a fuel cell.
As the Swedish hybrid-electric startup takes a step toward flying a prototype of its regional aircraft, the road to certification remains long and risky.
Heart also plans to fly the X1 within the next six months from a yet-to-be-decided airport in the U.S., which would make it the first new-generation hybrid aircraft to reach that milestone.
The advancement of hydrogen and electric propulsion research at Royal NLR comes as several Netherlands-based companies are designing new-generation aircraft.