page_title: List of experimental aircraft
section_title: United States
hierarchical_section_title: List of experimental aircraft / United States
context_page_description: This is a list of experimental aircraft, or aircraft used or built to conduct experiments involving aerodynamics, structural materials, propulsion systems, configuration and equipment. Prototypes, pre-production and homebuilt aircraft described as experimental but which were not used in this manner outside their own development are excluded.
caption: Bell X-5 variable-sweep wing testbed
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