The NACA: A Look Back
Many of Langley Laboratory's early experiments focused on ways to reduce aircraft drag. One method was to place a cowling or covering over the engine cylinder heads, much like the hood over the engine of a car. By the end of September 1928, wind tunnel tests of cowling #10 showed a dramatic reduction in drag.
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https://www.nasa.gov/image-detail/naca-look-back-8/
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