Transferred from the Smithsonian Institution to the United States National Museum.
Airfoil section used on Langley whirling arm. Parabolic curve with high point 3/4 inches (1.9 cm) back of leading edge and maximum depth of curvature 15/16 inches (2.4 cm). Appears to be the pair of A19820661000. Cutout for metal insert in one end similar to A19820661000, but piece is missing. Same dimensions.