At about 200mph he will start the pump to deliver the HTP into the rocket.

ECONOMIST: The land-speed record

When the HTP comes into contact with a catalyst contained within the rocket, it turns into steam and oxygen.

ECONOMIST: The land-speed record

Sue Firth, author of "More Life -- Less Stress, " and a psychologist and business stress expert, carries 5-HTP supplements when traveling, available in all large chemists, to counteract serotonin depletion.

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It is contained within the case of the rocket, into which is pumped a liquid oxidiser called high-test peroxide (HTP), a concentrated form of hydrogen peroxide which is relatively safe to handle.

ECONOMIST: The land-speed record

In this configuration, the HTP is passed over a catalyst pack to decompose it into steam and oxygen, but instead of igniting a fuel grain, this superhot gas is allowed simply to vent through the chamber nozzle.

BBC: Science & Environment