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NACA cowling
Aircraft engine fairing / From Wikipedia, the free encyclopedia
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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. It was a major advance in aerodynamic drag reduction, and paid for its development and installation costs many times over due to the gains in fuel efficiency that it enabled.[2]
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![Thumb image](http://upload.wikimedia.org/wikipedia/commons/thumb/0/07/Curtiss_AT-5a_NACA_Cowling_-_GPN-2000-001724.jpg/640px-Curtiss_AT-5a_NACA_Cowling_-_GPN-2000-001724.jpg)