Pratt & Whitney Hornet

R-1690 Hornet
Pratt & Whitney Hornet, at the Deutsches Museum, Munich.
Type	Radial engine
National origin	United States
Manufacturer	Pratt & Whitney
First run	June 1926
Major applications	Lockheed Lodestar O2U Corsair Sikorsky S-42
Number built	2,944
Developed into	Pratt & Whitney R-1860 BMW 132

The Pratt & Whitney R-1690 Hornet was a widely used aircraft engine. Developed by Pratt & Whitney, 2,944 were produced from 1926 through 1942. It first flew in 1927. It was a single-row, 9-cylinder air-cooled radial design. Displacement was 1,690 cubic inches (27.7 L). It was built under licence in Italy as the Fiat A.59. In Germany, the BMW 132 was a developed version of this engine. The R-1860 Hornet B was an enlarged version produced from 1929.

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