Following an initial hour-long, battery-powered flight, AeroVironment’s Global Observer unmanned aircraft is beginning a test program planned to culminate in a week-long flight in the stratosphere using liquid-hydrogen fuel. The flight debuts an innovative approach to persistent surveillance and marks a dramatic departure for a company that dominates the market for small, hand-launched UAVs. The Global Observer (GO) is flying from Edwards AFB, Calif., where it will undergo an operational ...


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