NACA cowling
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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 in 1927. I
Curtiss AT-5A Hawk with NACA cowling at the Langley Memorial Aeronautical Laboratory, October 1928
Close-up of the cowling on the Curtiss AT-5A
Dornier Do Y
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The Dornier Do Y was a trimotor German monoplane bomber of the early 1930s designed by Dornier Flugzeugwerke to an order by the Royal Yugoslav Air Force. The Yugoslavs originally intended to use war r
A Dornier Do Y of the Royal Yugoslav Air Force