The B-2 Spirit can take off from the United States, fly across an ocean, enter heavily defended airspace, drop its payload, and return… without ever appearing clearly on enemy radar. But the design that makes it nearly invisible should not be able to fly. The B-2 is a massive flying wing with no vertical tail, a shape that engineers had tested decades earlier and abandoned because it was too unstable to control. Earlier prototypes drifted in flight, resisted control inputs, and even broke apart in midair. For years, the concept was considered a dead end. What changed was not the shape, but the technology behind it. The B-2 relies on a complex flight-control system that constantly corrects its movement, making thousands of adjustments per second just to keep the aircraft stable. Without it, the bomber would be uncontrollable. At the same time, every part of the aircraft is built to reduce

Source: Why America Built a Bomber It Already Knew Couldn’t Fly