It's a hybrid. They started with an older design, updated the materials, then during wind tunnel testing they redesigned into a somewhat new aircraft.
There are portions that are recognizable as an older design, and parts that aren't.
Flying wings are almost uncontrollable at supersonic speeds. You can get into the transonic range, and close to supersonic but once you cross over the
sound barrier you have a stone cold bitch just waiting for the tiniest mistake.
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