DETERIORATION AND CRACKING OF FAN BLADES IN THE ALTITUDE WIND TUNNEL AWT
A researcher examines a worn wooden fan blade in the Altitude Wind Tunnel (AWT). The blades were damaged and worn over time despite protective screens upstream (12/7/1949).
Image Credit: NASA/MARTIN BROWN
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https://www.nasa.gov/image-detail/grc-1949-c-24850/
Image CreditNASA/MARTIN BROWN
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