In addition to the lower IR signature, and according to a conversation with an engineer who saw the data, the YF-23 beat the YF-22 by 10 DECIBELS on radar signature, which translates to a roughly 44% reduction in detection range (detection range varies with the fourth root of the radar cross section). Wind tunnel testing showed the YF-23 to already be stable to 60 degrees angle of attack, and thrust vectoring could have been added, according to Northrop engineers.
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