DAF 44 car, 1967, Registration no. ATE 79E, chassis no. 501 458, converted by Shell Research Ltd at Thornton Research Centre to be powered by a hydrogen fuel-cell to demonstrate the feasibility of fuel cells for vehicle propulsion. The standard petrol engine has been replaced by a solid state control system developed by Lucas Research Centre. The fuel cells, mounted in the boot of the car, react hydrazine with air to produce electricity which provides the base load energy at cruising speed. Additional energy is provided by lead-acid batteries which are kept charged by the fuel cells during periods of low energy consumption. The car has a top speed of 50 mph and a weight of 3,040 lbs.; 47% more than the standard DAF 44.