Rolls-Royce Hydrogen research tests 

Rolls-Royce has started a new set of ground-breaking hydrogen research tests.
Both Rolls-Royce and its partner easyJet are committed to being at the forefront of the development of hydrogen combustion engine technology capable of powering a range of aircraft, including those in the narrowbody market segment, from the mid-2030s onwards.
The latest set of tests, to prove aerospace cryogenic liquid hydrogen pump systems, have begun at Rolls-Royce’s facility at Solihull, UK.
These will address a key engineering challenge of taking low-pressure liquid hydrogen, chilled below -250°C, and pressurising it so that it can then be pumped into an engine to be combusted.
Rolls-Royce has identified three technology challenges in the journey to enabling hydrogen for use in aviation: fuel combustion, fuel delivery and fuel systems integration with an engine. All elements must be confirmed to operate safely.