1. Pre-cooler
During flight air enters the pre-cooler. In 1/100th of a second a network of fine piping inside the pre-cooler drops the air's temperature by well over 100C. Very cold helium in the piping makes this possible.

2. Jet engine
Oxygen chilled in the pre-cooler by the helium is compressed and used to fuel the aircraft. In the test run, a jet engine is used to draw air into the pre-cooler, so the technology can be demonstrated.

3. The silencer
The helium must be kept chilled. So, it is pumped through a nitrogen boiler. For the test, water is used to dampen the noise from the exhaust gases. Clouds of steam are produced as the water is vapourised.

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