Emitting nothing but water vapour into the atmosphere, the HY4 passenger plane is at the forefront of sustainable air travel and the first of its kind to carry more than one person. This four-seater design is powered by hydrogen fuel-cells that convert fuel directly into electrical energy.
The aircraft had its first flight from Stuttgart Airport in Germany in 2016 and was developed in collaboration between manufacturer Pipistrel, Canadian fuel-cell specialists Hydrogenics, the University of Ulm and the German Aerospace Center Institute of Engineering and Thermodynamics.
