The Lockheed D-21, a high-speed, high-altitude drone, was an unmanned variant of the illustrious SR-71 Blackbird. The following exploration delves into the intriguing design, development, and ...

Even more Top Secret than the Lockheed SR-71, the D-21 drone was a promising Cold War idea that could have eliminated the need for manned overflights, although it was mostly unsuccessful. After the ...

Designed in the 1960s at the height of the Cold War, the Lockheed D-21 was a high-speed reconnaissance drone developed as an offshoot of the SR-71 Blackbird program. Built to fly at Mach 3+ and at ...

Lockheed developed a spy drone in the 1960s that crashed in China. China recently debuted a supersonic drone that bears a striking resemblance to Lockheed's D-21. The D-21's urgent development was ...

The Lockheed D-21 Was More Than a Mini-Version of the SR-71 Blackbird – The concept of “military drone” is one that is often associated with the 21st century, but actually ...