It was revived as OAV-2 in 2004, with DARPA specifying a diesel-powered ducted-fan vertical-takeoff UAV with a weight of 51 kilograms (112 pounds), including a payload of 10 kilograms; a range of 10 kilometers ; a top speed of 92 km/h (50 knots); the ability to hover in a 37 km/h (20 knots) wind; an endurance of two hours; and a ceiling of 3,350 meters (11,000 ft).