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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 Hornet:License production of the Hornet in Germany, independently developed as the BMW 132.

Applications

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)

thumb|R-1690 with chamber walls cut away to show internal workings

See also

References

Notes

Bibliography

  • Pratt & Whitney R-1690 page