But SR-71 was in operation untill 1998.

送交者: year2226 于 2010-08-11, 17:56:17:

回答: M-21 was infamous for its faliure rate. The program was canciled 由 steven 于 2010-08-11, 17:43:15:

This means that spy satelites cannot replace reconnaissance crafts completely. wonder now if there is still a reconnaissance craft like SR-71 in service.

所有跟贴:

We used SR-71 to simulate Satellite pass through in early 90s :) - steven (44 bytes) 2010-08-11, 18:04:28 (473718)
- I know that. I am interested in SR-71 because M-21/D-21 is a failed project. (无内容) - year2226 (0 bytes) 2010-08-11, 18:41:12 (473723)
  - SR-71 and M-21 were developed the same time by the same team. (无内容) - steven (0 bytes) 2010-08-11, 18:44:38 (473724)
    - so why d-21 failed, but sr-71 sounds so successful ? (无内容) - year2226 (0 bytes) 2010-08-11, 19:02:21 (473732)
      - D-71 was too complicated for its time. - steven (45 bytes) 2010-08-11, 20:05:48 (473751)

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