The Lockheed M-21/D-21 are a pair of high-speed reconnaissance aircraft created by Lockheed in the early 1960s based on the A-12 Archangel project. The project involved the creation of the M-21 carrier aircraft, which was supposed to act as a carrier for the D-21 high-speed unmanned reconnaissance aircraft. The drone was capable of flying at speeds over Mach 3.3 at altitudes of about 27 kilometers. The project was implemented, however, the tests showed the extreme complexity and danger of the im
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Lockheed D 21 - Alchetron, The Free Social Encyclopedia
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