North American XF-108 Rapier

The North American Aviation XF-108 Rapier was a glimpse into the future of air combat during its conception in the late 1950s. Designed as a long-range, high-speed interceptor intended to defend the United States from supersonic Soviet bombers, the XF-108 promised unparalleled performance. With plans for a top speed of over Mach 3, the Rapier was to be equipped with advanced radar systems and armed with air-to-air missiles capable of engaging enemy aircraft at long distances. Although the XF-108 never progressed beyond the initial design phase and was canceled in 1959 due to budget constraints and shifting defense priorities, it remains a fascinating what-if in aviation history. The project's ambitious goals highlighted the technological aspirations of the era and contributed to advancements in aerospace engineering that would benefit future projects, including its sister program, the XB-70 Valkyrie.