The Pratt & Whitney Hornet series occupies a significant place in the development of reliable and powerful engines for both commercial and military operators. This R-1860-B Hornet was manufactured for the U.S. Army Air Corps in 1932. The engine is most closely associated with the Sikorsky S-40 and S-41B flying boats. Subsequently, Pratt & Whitney engines powered nearly every flying boat built by Sikorsky.

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