NACA cowling

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Science and technology

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What Wikipedia says

The NACA cowling is a type of aerodynamic fairing used to streamline radial engines installed on airplanes. It was developed by Fred Weick of the National Advisory Committee for Aeronautics (NACA) in 1927.

Excerpt from the Wikipedia article “NACA cowling”, under the CC BY-SA 4.0 license. Read the article on Wikipedia

Image: NACA/photographer unknown, Public domain, via Wikimedia Commons.