NASA Eyes Secret D-21 For RLV Engine Tests
NASA is moving to resurrect a once super-secret Cold War reconnaissance aircraft--the D-21 supersonic drone--for reusable launch vehicle (RLV) propulsion tests. The D-21 is a Mach 3.3 ramjet reconnaissance vehicle first launched piggyback in 1966 off the back of the M-12 version of the YF-12 fighter...
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