A ground-breaking hydrogen-powered city car, which has been designed in Britain and financed by the grandson of Ferdinand Porsche, is to be unveiled next week.
Autocar can reveal that the Riversimple Urban Car will have a far smaller fuel cell than in current industry prototypes and thus needs less hydrogen to be stored on board and in fuelling stations.
The vehicle is no bigger than a Smart car, weighing just 350kg, and has been developed over three years by teams at Oxford and Cranfield universities.
It can reach 50mph and travel in excess of 200 miles, consuming the equivalent petrol energy of 300mpg in hydrogen.
Power comes from a 6kw fuel cell, which is tiny compared to the 100kw system powering the Honda Clarity.
It uses a composite body to keep the weight down and four electric motors on each wheel, which double as brakes and electricity generators.
There is a bank of ultracapacitors to store this electricity, which in turn provides most of the accelerating power, allowing for a small fuel cell.