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The D-2, was built by Scaled Composites and was designed to test technologies that could result in long-duration (12 to 72 hours), high-altitude vehicles capable of carrying science payloads. Key technology development areas included lightweight structures, science payload integration, engine development and flight-control systems. Flight tests began Aug. 23, 1994. In late 1996, NASA demonstrated over-the-horizon communication capabilities with the D-2 using the Tracking and Data Relay Satellite System to command and control the aircraft. D-2 Home Page
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