The X-4, a single-place, low swept-wing, semi-tailless aircraft was designed and built by Northrop Aircraft, Inc., for NACA. 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. The two X-4 aircraft were 23 ft long, 14 ft high, and had wingspans of 26 ft. They weighed almost 8,000 lb at takeoff. Mahogany Wood. Scale: 1/32. Wingspan 10 1/4 inches, Length 9 3/4 inches. This model is hand signed by General Chuck Yeager who flew the X-4 on several test flights. A true collectors item! Model is signed on the top wing and comes with letter and picture. LIMITED EDITION.