Project phoenix

The world’s first liquid hydrogen-powered aircraft

One Team, Two Projects

We are executing our mission by designing and manufacturing a 1:3 scale prototype and a full scale aircraft both powered by hydrogen. With this project we aim to build the first manned aircraft to fly on liquid hydrogen where we aim to remove CO2 emissions altogether by using this very potent fuel source.

Although Project Phoenix starts as a world’s first, we firmly believe that the aviation industry needs to follow our example and we aim to inspire the bigger companies. 

Why hydrogen?

A number of solutions to the sustainable aviation problem have been advocated in the past. Broadly speaking, these solutions fit into three categories: kerosene equivalents, batteries and hydrogen. Biofuels and synthetic kerosene, although a potential temporary solution to the aviation industry’s carbon emissions, are not sustainable in the long-term. The impact on air quality as a result of NOx emissions by combusting kerosene or kerosene equivalents is up to 4.4 times higher than the impact of CO2 emissions on the environment.

Batteries are not suited for aviation on their own due to their weight. However, battery and hydrogen technologies are closely linked since both make use of the same electric engines. Hydrogen in gaseous and liquid state as well as contained in carrier fluids is seen by many to be the long-term solution. A single wind turbine would be able to provide the power for a commercial aircraft. Fuel cell technology has the potential to change not only aviation but transportation in general, leading to a sustainable, future hydrogen economy.


Although our aircraft are small, our ambition is not. For example, we are working internationally to develop certification guidelines for hydrogen propulsion. We firmly believe that our work will impact and inspire the future of the aviation industry.

Prototype Phoenix

Stepping Stone Towards a Sustainable future

Prototype Phoenix is a 1:3 scale of the E-genius airplane, with a maximum take off weight of 45 kg and a wingspan of 5.7m. In Summer 2022, the Phoenix Prototype took its first flight at NLR Marknesse on batteries. Click here to watch its maiden flight. In 2023, this prototype will fly on gaseous hydrogen before advancing to liquid hydrogen!


5.7 m

Max Take Off Weight


Range LH2


Endurance LH2

3+ hrs

Mass of GH2


Fuel Cell Power

1.5 kW

Mass of LH2


Hydrogen propulsion

The 1:3 scale prototype is powered by a 1500W fuel cell coupled with a battery pack for take-off power and safety. Hydrogen is kept in a cryogenic tank at -253°C and warmed to 0°C using a complex tubing system.

Fly long, and far

Powered by an electric motor on its tail, Phoenix is able to fly for 3+h with just 380g of liquid hydrogen, covering a distance of almost 300km. These endurance and range values are unmatched by batteries and conventional fuels.

Full-Scale Phoenix

World’s first liquid hydrogen powered aircraft

Full-Scale Phoenix is a 2-seater Sling 4 aircraft, with a maximum take-off weight of 920 kg and a wingspan of 10m.  In July 2021, we received our Sling 4 kit which will enable us to start working on integrating all the systems to be able to fly our first Full-Scale flight. Since then, the full scale has successfully taxied at Breda airport. This aircraft will fly on gaseous hydrogen in 2024 and liquid hydrogen in 2025.


10 m

Max Take Off Weight

920 kg

Range LH2

400 km

Endurance LH2

2 hrs

Mass of GH2

1.45 kg

Fuel Cell Power

125 kW

Mass of LH2

10 kg


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