The great six-engine XB-70 Valkyrie was designed by way of
North American Aviation within the past due 1950s. The aircraft was constructed
as a prototype for a proposed nuclear-armed strategic bomber. The XB-70
Valkyrie finished its design speed on Oct. 14, 1965, whilst it expanded to Mach
three.02 (2,000 mph, or 3,219 km/h), at an altitude of 70,000 toes (21,300 m)
over Edwards Air pressure Base in California.
two XB-70s have been built and utilized in supersonic test
flights from 1964 to 1969. whereas one of the prototypes was lost in 1966 after
a midair collision, the other XB-70 is on show for the public to view on the
national Museum of the united states Air force in Dayton, Ohio.
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