XB 70 Valkyrie, The American supersonic strategic bomber that never was, Upscaled HD version
The North American Aviation XB70 Valkyrie was the prototype version of the planned B70 nucleararmed, deeppenetration supersonic strategic bomber for the United States Air Force Strategic Air Command. Designed in the late 1950s by North American Aviation (NAA), the sixengined Valkyrie was capable of cruising for thousands of miles at Mach 3+ while flying at 70, 000 feet (21, 000 m). At these speeds, it was expected that the B70 would be practically immune to interceptor aircraft, the only effective weapon against bomber aircraft at the time. The bomber would spend only a brief time over a particular radar station, flying out of its range before the controllers could position their fighters in a suitable location for an interception. Its high speed made the aircraft difficult to see on radar displays and its highaltitude and highspeed capabilities could not be matched by any contemporaneous Soviet interceptor or fighter aircraft. The introduction of the first Soviet surfacetoair missiles i
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