鸭式无尾翼布局具有高度机动性和优越的超音速性能，但亦具有先天空气动力上之不稳定性。
The tailless delta-canard configuration is inherently aerodynamically unstable, which provides a high level of agility, particularly at supersonic speeds.
参与竞争的两种无人机均为单一扇涡轮驱动的无尾翼飞行飞机，除此以外，X - 47 B被设计用于航母作战，具有可折叠机翼，并装备有尾部吊钩。
While both competitors are tailless flying wings powered by single turbofans, the X-47B was designed for carrier operations and features folding wings and a tail hook.
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