Using hydrogen as fuel with pure water as the only emission has long given fuel cell power a tantalizing upside. Fuel cells helped power NASA to the moon, though the technology has struggled to find a foothold in aviation. A recent flight in Germany of a twin-fuselage aircraft with four seats and a single electric motor followed the departure of another once-touted hydrogen aircraft from Edwards Air Force Base—Boeing’s Phantom Eye, which first flew in 2012. It left the California desert Aug. 30 on the bed of a truck, headed for a museum.
Source: aopaMore highs, lows for hydrogen aviation