UB replaced the R44’s piston engine with a hydrogen fuel cell powertrain and Magnix electric motor, a configuration that also includes a small battery pack to manage transient power demands. During the flight, around 90% of the energy required was provided by the two fuel cell stacks.   Partners hail success of hydrogen helicopter first flight Hydrogen Aviation ..

via The Energy Collective – The worl… https://ift.tt/OEXfJwr