The Lockheed QT-2PC "Prize Crew" proved the silent, night recon airplane concept. Lockheed Missiles and Space was given the go ahead to develop what became the YO-3A. The Lockheed Q-Star was the development platform for the YO-3A. It was the 1st airplane to use a Wankel Rotary engine. The final edition of the Q-Star had a Wankle engine with a radiator in front.