An Australian IT tycoon designing racecars as fast as Formula 1 cars for mega-rich "Gentlemen drivers" is test-driving his 300km/h prototypes himself.

Multi-millionaire David Dicker has spent the past four years developing the world's fastest hypercar on a purpose-built circuit in a quiet corner of rural New Zealand.

The Rodin FZero supercar, a remarkable mega-millionaire boy's toy which could sell for more than $1.2 million, is nearing completion.

And 66-year-old Dicker, despite two recent high-speed crashes, has vowed to strap himself in for its maiden test runs.

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"If you have someone like me driving it, then the other guys think

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