North American P-51D Mustang
A white plate on the top of the wing of a restored National Advisory Committee for Aeronautics (NACA) P-51D Mustang mounts scale airfoil shapes as used by the NACA in the late 1940s for high-speed research.
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https://www.nasa.gov/image-detail/north-american-p-51d-mustang-3/
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