The Pratt & Whitney R-1690 Hornet was a widely used American 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 license 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. Variants R-1690-3 R-1690-5 R-1690-11 R-1690-13 R-1690-S5D1G R-1690-52 R-1690-SDG R-1690-S1EG R-1690-S2EG R-1690-25 R-1690-S1C3G Fiat A.59 R. License built in Italy with reduction gearing. Fiat A.59 R.C. License built in Italy with reduction gearing and supercharger. BMW HornetLicense production of the Hornet in Germany, independently developed as the BMW 132. Applications Bach Air Yacht Bellanca 31-40 Boeing 80 Boeing Model 95 Boeing Model 299 Burnelli UB-14 Douglas O-38 Focke-Wulf Fw 200 V1 Gee Bee Model R-2 (1933) Gee Bee R 1/2 Super Sportster Granville-Miller-de Lackner R-6H "Q.E.D." Junkers Ju 52 Junkers Ju 86 Junkers W 34 Keystone B-3 Lockheed Model 14 Super Electra (L-14H) Lockheed Lodestar (C-56A, C-56B, C-56C, C-56D, C-56E, C-59/Mk 1a) Martin BM Martin XB-14 Vought O2U Corsair Sikorsky S-40A Sikorsky S-42 Sikorsky S-43 Wedell-Williams Model 44 Engines on display There is a R-1690 on display at the New England Air Museum, Bradley International Airport, Windsor Locks, CT. Specifications (R-1690 S1E-G) See also References Notes Bibliography External links Pratt & Whitney R-1690 page 1920s aircraft piston engines Aircraft air-cooled radial piston engines R-1690