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Published on Apr 22, 2010
Courtesy: NASA Dryden Research Center (Silent) The X-40A was an 85-percent scale version of the X-37 experimental space-access technology demonstrator. The unpowered X-40A flew several helicopter-launched approach and landing tests at NASA Dryden in 2001 to validate the autonomous guidance and navigation systems to reduce risk for the follow-on X-37 project.