Boeing has demonstrated that sustained, level flight in a manned aircraft can be achieved using nothing but a fuel cell for power, and is eyeing the technology for possible incorporation into unmanned aerial vehicles (UAVs). Francisco Escarti, managing director of Boeing Research & Technology Europe (BR&TE), thinks UAVs that tap a fuel cell’s inherent silence and lack of heat signature – no hot gas engine – are a natural for the surveillance UAV world. The fact that such aircraft ...

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