Hyzon's Gen3 fuel cell stack achieves a volumetric power density above 6.0 kW/litre and gravimetric power density more than 5.5 kW/kg, offering a power to weight ratio suitable for aviation.

ZeroAvia's 600kW powertrain has proved it can pull the company's 15-ton HyperTruck mobile ground testing platform across the tarmac. Tests aboard a Dornier 228 are expected later this year.

ZeroAvia has secured an additional $13 million for its 50+ seat engine development programme from AP Ventures, an investor in technologies across the hydrogen value chain, paving the way for service entry.