The Douglas X-3 Stiletto

Intended as a Mach 2 testbed, the underpowered X-plane looked fast but barely broke the sound barrier   Aviation enthusiasts who started out building plastic models in the 1950s likely remember the sleek, shapely designs they just had to find for their collections. Among the most sought-after were the supersonic X-planes, including the X-3, unofficially nicknamed the Stiletto. Its overall look—the long, needle-nosed fuselage, those impossibly vestigial-looking …

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