The aerospace sector's vast contributions often remain underappreciated by the general public, especially the intricate development of aircraft systems designed for highly specialized research. A prime example is the X-31 Enhanced Fighter Maneuverability Demonstrator.
The X-43A Hyper-X, an experimental vehicle developed by NASA, marked a significant milestone in aviation by demonstrating the viability of scramjet technology for achieving hypersonic speeds.
Alas, the first X-4 was grounded after a mere 10 flights. It was unreliable, so much so that NACA Muroc flight test unit head Walt Williams called the aircraft a lemon.
The Douglas X-3 “Stiletto” looks fast. Sleek and streamlined, resembling a rocket as much as an airplane, the X-3 was designed to hit a maximum speed of 2,000 miles per hour – all for the purpose of researching sustained supersonic speeds.