From the parasitic McDonnell XF-85 Goblin designed to be carried within a bomber’s belly to the Mach 3 long range North American XF-108 Rapier, these “paper planes” represented the absolute cutting edge of Cold War engineering. We analyze the technical breakthroughs and strategic shifts that led to their cancellation, uncovering how the rise of ballistic missiles and shifting defense priorities left legendary designs like the supersonic Sea Dart and the record breaking YF-12A on the drawing board. Delve into the high stakes world of modern aerospace competition, featuring the stealthy Northrop YF-23 Black Widow II and the Boeing X-32 Joint Strike Fighter demonstrator. This documentary collection examines why advanced prototypes like the F-16XL and the F-20 Tigershark failed to secure production contracts despite their impressive capabilities and innovative designs. Whether it was the pur

Source: Never – Built US Fighter Jets We Nearly Got