In this 1950 view of the right side of the NACA High-Speed Flight Research Station's X-4 research aircraft, the low swept wing and horizontal tailless design are seen.
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In this 1950 view of the right side of the NACA High-Speed Flight Research Station’s X-4 research aircraft, the low swept wing and horizontal tailless design are seen. The X-4 Bantam, a single-place, low swept-wing, semi-tailless aircraft, was designed and built by Northrop Aircraft, Inc. It had no horizontal tail surfaces and its mission was to obtain in-flight data on the stability and control of semi-tailless aircraft at high subsonic speeds.August 1950NACA/NASA Photo› X-4 Project Description