Pratt & Whitney R-1690 Hornet
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
A single Boeing Model 80A, modified as a freighter for use in Alaska, is displayed at the Museum of Flight at Seattle.