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Northrop's design team and mine worked in total ignorance of what the other side was doing. But following basic laws of physics, they came up with strikingly similar designs -- a flying wing shape.
I had absolutely no idea that we and Northrop were designing the same basic airplane shape until Gene Fubini, head of the Defense Science Board, came to visit me at the dek and gasped "How in hell did you get a model of the Northrop stealth bomber?"
...it also created a few significant structural differences in the two models. Because [Lockheeds] airplane was designed to be smaller, the control surfaces on the wings were smaller, too, which meant [Lockheed] needed a small tail for added aerodynamic stability. Northrop had larger control surfaces and needed no tail at all.