 Range and endurance were intended to be similar to that of the Predator, though the Darkstar's sensor suite could cover over twice the area, and of course it was harder to detect.The Darkstar was powered by a Williams Research FJ-44-1A turbofan engine with 8.46 kN (862 kgf / 1,900 lbf) thrust, and could carry a 450 kilogram (1,000 pound) payload.The UAV was to cost about US$10 million each.