THE problem of cowling radial air‐cooled engines has puzzled aircraft designers since the adoption of the static radial engine. The cowling has an important effect on both the cooling of the engine and the drag of the airplane, and no reliable data on either have been available.
(1929), "Streamlining Air‐Cooled Engines: As a Result of American Tests a Curtiss AT‐5a Machine Shows a Speed Increase of 19 m.p.h.", Aircraft Engineering and Aerospace Technology, Vol. 1 No. 1, pp. 11-12. https://doi.org/10.1108/eb029092
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