Maybe just an artist's impression of a general concept without designation. On the other hand, after reading all the 'Related Temporary Design Designations' in Putnam's Lockheed Aircraft since 1913, Lockheed seems to be the company with the most designations worldwide ;D .
A video which fits better to the title of this topic.
http://www.youtube.com/watch?v=P94g7TszBFg&feature=player_embedded
Please notice the retractable skid landing gear shortly after take-off.
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