D-21: The Nearly Forgotten Mach 3.2 Drone Built to Spy on China
According to declassified documents, the D-21 was developed to be fitted to a specially modified variant of the SR-71 Blackbird — the M21.
Source: nationalinterest.org
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Whoops: Once America Lost D-21 a Spy Drone in Soviet Russia
In November 1969, the U.S. Air Force sent Russia an early Christmas gift. It was a sleek flying machine that bore an uncanny resemblance to the SR-71 Blackbird spy plane. The American generosity was purely unintentional. The aircraft was actually a cutting-edge drone dispatched on a mission to photograph Communist Chinese nuclear sites. And the drone did what it was supposed to until it failed to turn around, and kept on going north into Siberia before crashing. If imitation is the sincerest form of flattery, then Russia paid the skilled aircraft designers at Lockheed the highest compliment: ...
Source: nationalinterest.org