The challenge: to harness energy from the wind to power a simple windmill.

The teams must harness energy from a renewable source – the wind – to power a simple machine. The challenge is to test who can make the most efficient windmill to drive a simple grinding wheel to grind some coffee beans at Beachy Head. The teams have a huge number of different windmill designs to choose from, including one with multiple vanes that turn in the vertical axis and another with only a few vanes turning in the horizontal plane. The winner will be the team whose machine grinds the most coffee (by weight) in an hour.

Click here for Robert's dramatic interpretation of a windmill.

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