Helicopters with Fuel Cells

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A stack of lightweight fuel cells: The individual cells are held apart by plastic spacers. Measuring 2 x 5 x 4 centimeters the structure is not much bigger than a matchbox. Credit: Fraunhofer IZM
A stack of lightweight fuel cells: The individual cells are held apart by plastic spacers. Measuring 2 x 5 x 4 centimeters, the structure is not much bigger than a matchbox. Credit: © Fraunhofer IZM

The old saying that "there is strength in numbers" also applies to fuel cells. To deliver a high enough power output, a number of cells have to be connected in series. Manufacturers normally stack the fuel cells – a structure consisting of several metal plates, each containing one channel for air and one for hydrogen. This makes the fuel cell stack quite heavy.


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