English: The second Lockheed XH-51A, BuNo 151263, following its conversion into a compound rotorcraft testbed. The single J60 turbojet, stub wings and other refinements allowed the XH-51 Compound to set an unofficial rotorcraft level-flight speed record in June 1967. The chin-mounted probe carried special test intrumentation.
|Author||San Diego Air and Space Museum Archives|
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U.S. Army photograph via San Diego Air & Space Museum Archive
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