LOS ANGELES — A two-seat production derivative of Northrop Grumman’s secretly developed Firebird medium-altitude optionally piloted vehicle (OPV) demonstrator has begun test flights for an unidentified customer. Flown by two Northrop test pilots, the OPV made its first flight from Mojave, Calif., on Nov. 12. Powered by a single Lycoming TEO-540E piston engine, the twin-boom configured aircraft climbed to 3,880 ft. and reached a maximum speed of 100 kt. during a short, 6-min. ...


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