Insitu has become the latest unmanned aircraft manufacturer to fly a fuel-cell powerplant in one of its designs. A 1,500-watt (2 hp) fuel cell produced by United Technologies and a hydrogen fueling system developed by the Naval Research Laboratory were integrated into a ScanEagle UAV, which met its performance targets on a 2.5-hr. test flight. Insitu says it will conduct a fuel-cell test flight in its larger Integrator UAV later this year, in collaboration with the Air Force Research ...

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