Lockheed Martin / Bell Helcopter Propulsive Anti-Torque System (PATS) test rig. The PATS test rig was used during the DARPA / US Army Unmanned Combat Armed Rotorcraft program (UCAR). It was designed to demonstrate the elimination of the need for a tail rotor, as well as increase maximum aircraft speed. From Vertiflite, Fall 2004 (page 43).
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