Hydrogen Aviation: Can Planes Run on Water-Derived Hydrogen?

Aviation's Hydrogen Challenge

Commercial aviation requires energy-dense fuel because every kilogram matters at 35,000 feet. Liquid hydrogen contains 2.8× more energy per kilogram than jet fuel — excellent. But it requires cryogenic storage at −253°C and tanks 4× larger by volume than equivalent jet fuel. Aircraft would need radical redesign to accommodate hydrogen storage.

Airbus ZEROe Program

Airbus announced three ZEROe concept aircraft in 2020, targeting entry into service by 2035:

• Turbofan concept: Modified turbofan burning hydrogen instead of kerosene, range 3,700 km
• Turboprop concept: Hydrogen combustion turboprop for regional routes, range 1,800 km
• Blended wing body: Radical design with hydrogen tanks in the fuselage, range 3,700 km

Fuel Cell Aircraft

Smaller fuel cell aircraft are already flying. ZeroAvia flew a 19-seat Dornier 228 on hydrogen fuel cells in 2023. Hydrogen fuel cells driving electric motors suit smaller regional aircraft (under 100 seats) better than large jets, where direct hydrogen combustion is more feasible.

HHO Connection

HHO supplementation has been explored in small piston aviation engines (Cessna 172-class) for fuel economy improvement. The same principles apply — hydrogen's fast flame speed improves combustion in air-cooled aircraft engines. FAA experimental aircraft certification allows some HHO installations for research purposes.