Northrop Grumman will begin wind-tunnel tests in January of the tail-sitting vertical-takeoff-and-landing (VTOL) concept that is the finalist in Darpa’s Tern program to demonstrate a Predator-class unmanned aircraft able to operate from smaller U.S. Navy warships. Revealing details of the configuration for the first time, Northrop says the tests are aimed at corroborating earlier analysis work and are expected to lead to a Darpa contract for sea-based flight testing of a demonstrator. ...

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