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09/30/2007. In 1968 Lockheed Missiles and Space Co. acquired a Schweizer SGS 2-32 X-26 glider from the US Navy Test Pilot School and modified it as a quiet flight research and development aircraft. Initially it was powered by a conventional Continental O-200 engine mounted behind the cockpit driving a propeller mounted on a pylon at the aircraft’s nose. Later it was re-engined (pictured) with a Curtiss-Wright RC2-60 liquid-cooled rotary (Wankel) engine and square Corvette radiator was fitted at the nose. The aircraft flew with various sizes and shapes of three-, four- and six-bladed propellers.