The YF-23 featured a unique ... Prototype Air Vehicle 1 (PAV-1), which was painted charcoal gray and unofficially nicknamed "Spider" or "Black Widow II" – in honor of the Northrop P-61 Black ...
Indeed, the YF-23 reached up to Mach 1.6 and could supercruise at Mach 1.8 once afterburners were engaged. Because of its unique shape, the YF-23 simply did not appear on radars at certain angles.
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