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The North American Aviation XB-70 Valkyrie is a retired prototype version of the planned B-70 nuclear -armed, deep-penetration supersonic strategic bomber for the United States Air Force Strategic Air Command.
The design shared XB-70 components and materials like its ejection seat, engine, and honeycomb structure. The USAF canceled the Rapier in 1959 due to projected high costs.
Feb 28, 2014 · The XB-70 Valkyrie, with a planned cruise speed of Mach 3 and operating altitude of 70,000 feet, was to be the ultimate high-altitude, high-speed manned strategic bomber.
Jan 30, 2026 · Explore the XB-70 Valkyrie, its Mach 3 speed, radical design, Cold War origins, test flights, cancellation, and lasting impact on supersonic aviation.
1 day ago · America's XB-70 flew Mach 3 at 70,000 feet and was canceled before combat. The reason why should worry every Pentagon planner today.
Mar 12, 2026 · The XB-70 Valkyrie could fly at Mach 3 and 70,000 feet — faster and higher than almost anything in the sky. It was the most advanced bomber ever designed. Then missiles made it obsolete before it ever e...
Sep 13, 2025 · Key Points and Summary – The XB-70 Valkyrie was the U.S. Air Force’s bid to outrun Soviet defenses: a six-engine, compression-lift bomber built for sustained Mach 3 at extreme altitude.
6 days ago · The North American XB-70 Valkyrie was a groundbreaking strategic bomber developed during the Cold War era. Its design and technology pushed the boundaries of what was possible in supersonic flight, influe...
The XB-70 is a high-altitude, Mach 3-capable nuclear bomber that could outrun and outfly any known threat. The aircraft was developed by North American Aviation, the same company behind the P-51 Mustang and the F-86 Sabre.
Despite their exceptional performance, the XB-70 program had been cancelled by the time the Air Force flight tests were completed. The two prototypes were then transferred to NASA as high-speed research aircraft to pr...
