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Pratt & Whitney R-1690 Hornet

From Wikipedia, the free encyclopedia

R-1690 Hornet
Pratt & Whitney R-1690 Hornet jaypee.jpg
Pratt & Whitney Hornet, at the Deutsches Museum, Munich.
Type Radial engine
National origin United States
Manufacturer Pratt & Whitney
First run June 1926
Major applications Boeing 80
Lockheed Lodestar
Sikorsky S-42
Vought O2U Corsair
Number built 2,944
Developed into Pratt & Whitney R-1860
BMW 132
Mitsubishi Kinsei

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.[1] 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.


525 hp (392 kW)
525 hp (392 kW)
775 hp (578 kW)
625 hp (466 kW)
700 hp (522 kW)
750 hp (559 kW)
750 hp (559 kW)
850 hp (634 kW)
1,050 hp (780 kW)
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.


Engines on display

Specifications (R-1690 S1E-G)

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

Data from [3]

General characteristics

  • Type: Nine-cylinder single-row supercharged air-cooled radial engine
  • Bore: 6 18 in (155.6 mm)
  • Stroke: 6 38 in (161.9 mm)
  • Displacement: 1,690.5 in³ (27.7 l)
  • Length: 50.98 in (1,295 mm)
  • Diameter: 54.41 in (1,382 mm)
  • Dry weight: 1,014 lb (460 kg)



See also

Related development

Comparable engines

Related lists



  1. ^ Pratt & Whitney - R-1690 page Archived 2008-01-26 at the Wayback Machine Retrieved: 25 October 2008
  2. ^ "Pratt & Whitney R-1690 Hornet"
  3. ^ Tsygulev (1939). Aviacionnye motory voennykh vozdushnykh sil inostrannykh gosudarstv (Авиационные моторы военных воздушных сил иностранных государств) (in Russian). Moscow: Gosudarstvennoe voennoe izdatelstvo Narkomata Oborony Soyuza SSR. Archived from the original on 2009-03-24.


  • Gunston, Bill (2006). World Encyclopedia of Aero Engines, 5th Edition. Phoenix Mill, Gloucestershire, England, UK: Sutton Publishing Limited. ISBN 0-7509-4479-X.

External links

This page was last edited on 5 December 2020, at 22:14
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