Pratt & Whitney R-1690 Hornet

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"Pratt & Whitney Hornet" redirects here. For the Pratt & Whitney R-1860 Hornet B, see Pratt & Whitney R-1860.
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 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.[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 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.

Variants[edit]

For the R-1860 Hornet B series, see Pratt & Whitney R-1860.
R-1690-3
525 hp (392 kW)
R-1690-5
525 hp (392 kW)
R-1690-11
775 hp (578 kW)
R-1690-13
625 hp (466 kW)
R-1690-S5D1G
700 hp (522 kW)
R-1690-52
750 hp (559 kW)
R-1690-SDG
R-1690-S1EG
750 hp (559 kW)
R-1690-S2EG
R-1690-25
850 hp (634 kW)
R-1690-S1C3G
1,050 hp (780 kW)
Fiat A.59 R.
Licence built in Italy with reduction gearing.
Fiat A.59 R.C.
Licence built in Italy with reduction gearing and supercharger.
BMW Hornet
Licence production of the Hornet in Germany, independently developed as the BMW 132.

Applications[edit]

Engines on display[edit]

Specifications (R-1690 SIE-G)[edit]

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)

Components

Performance

See also[edit]

Related development
Comparable engines
Related lists

References[edit]

  • 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[edit]