In 1999, Britain's Richard Brown smashed the one-way speed record for a motorbike by hitting 584km/h on the salt flats of Bonneville, Utah. But his claim on the world record - based on the average of two runs in opposite directions - was prevented by technical problems.
Now he is aiming to be the first to exceed 720km/h while achieving an average two-way speed of at least 640km/h - using a jet-propelled bike called Jet Reaction. He has retooled a 930kW helicopter engine with an afterburner for extra oomph. - The New Zealand Herald