The massive XB-70 Valkyrie is the largest and heaviest airplane ever to fly at Mach 3. The North American XB-70 Valkyrie was the most ambitious super-bomber project of the Cold War. The massive ...

The Cold War was a wild era in the development of military technology, especially in the field of aerospace. From nuclear-powered strategic bombers concepts to Manned Orbital Laboratories (MOL) that ...

At Mach 3, you travel about 3,000 feet per second. That's over half a mile (or 10 football fields). And at 70,000 feet, you're twice as high as the average airliner. Only a handful of aircraft have ...

A Total Failure: The XB-70 Valkyrie was an experimental U.S. nuclear bomber developed in the 1950s and 1960s as a potential replacement for the B-52. Designed to fly at Mach 3 speeds and altitudes of ...