Power Plant: 2 XJ34-WE-17 Jets. Each 3,370 lb. thrust. Speed: Supersonic Length: 66 ft. 9 in. Weight (empty): 14,345 lbs. Height: 12 ft. 6 in. Span: 22 ft. 8 in. Designed for aerodynamics, structural, and other flight research in the March-2 range, the needlenosed X-3 has provided much data on aircraft with small thin wings. It was first test flwon on 20 October 1952 and is the forerunner of many current supersonic fighters. Of the two X-3's built, one is exhibited at the Air Force Museum, W-PAFB, Ohio.