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Pratt & Whitney R-1690 Hornet

Pratt & Whitney R-1690 Hornet

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 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.

R-1690 Hornet
Pratt & Whitney Hornet, at the Deutsches Museum, Munich.
TypeRadial engine
National originUnited States
ManufacturerPratt & Whitney
First runJune 1926
Major applicationsLockheed Lodestar
O2U Corsair
Sikorsky S-42
Number built2,944
Developed intoPratt & Whitney R-1860
BMW 132

Variants

R-1690-3525 hp (392 kW)R-1690-5525 hp (392 kW)R-1690-11775 hp (578 kW)R-1690-13625 hp (466 kW)R-1690-S5D1G700 hp (522 kW)R-1690-52750 hp (559 kW)R-1690-SDGR-1690-S1EG750 hp (559 kW)R-1690-S2EGR-1690-25850 hp (634 kW)R-1690-S1C3G1,050 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 HornetLicense production of the Hornet inGermany, independently developed as theBMW 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

  • 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 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.[2]

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 ​1⁄8 in (155.6 mm)

  • Stroke: 6 ​3⁄8 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

  • Valvetrain: Pushrod-actuated

  • Supercharger: Single-speed centrifugal type supercharger, 12.0:1 gear ratio

  • Fuel system: Two-barrel Stromberg carburetor

  • Fuel type: 87 octane rating gasoline

  • Cooling system: Air-cooled

  • Reduction gear: Epicyclic gearing, 2:3

Performance

  • Power output:

  • 789 hp (589 kW) at 2,300 rpm for takeoff

  • 740 hp (552 kW) at 2,250 rpm at 7,000 ft (2,135 m)

  • Specific power: 0.47 hp/in³ (21.26 kW/l)

  • Compression ratio: 6.0:1

  • Specific fuel consumption: 0.6 lb/(hp•h) (362 g/(kW•h))

  • Oil consumption: 0.42 oz/(hp•h) (16 g/(kW•h))

  • Power-to-weight ratio: 0.78 hp/lb (1.28 kW/kg)

See also

Related development

Comparable engines

  • Bristol Pegasus

  • Wright R-1750

Related lists

  • List of aircraft engines

References

[1]
Citation Linkweb.archive.orgPratt & Whitney - R-1690 page Archived 2008-01-26 at the Wayback Machine Retrieved: 25 October 2008
Sep 28, 2019, 3:37 AM
[2]
Citation Linkneam.orghttp://neam.org/index.php?option=com_content&view=article&layout=edit&id=1129 "Pratt & Whitney R-1690 Hornet"
Sep 28, 2019, 3:37 AM
[3]
Citation Linkbase13.glasnet.ruTsygulev (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.
Sep 28, 2019, 3:37 AM
[4]
Citation Linkwww.pw.utc.comPratt & Whitney R-1690 page
Sep 28, 2019, 3:37 AM
[5]
Citation Linkwww.pw.utc.comPratt & Whitney - R-1690 page
Sep 28, 2019, 3:37 AM
[6]
Citation Linkweb.archive.orgArchived
Sep 28, 2019, 3:37 AM
[7]
Citation Linkneam.orghttp://neam.org/index.php?option=com_content&view=article&layout=edit&id=1129
Sep 28, 2019, 3:37 AM
[8]
Citation Linkweb.archive.orgAviacionnye motory voennykh vozdushnykh sil inostrannykh gosudarstv (Авиационные моторы военных воздушных сил иностранных государств)
Sep 28, 2019, 3:37 AM
[9]
Citation Linkbase13.glasnet.ruthe original
Sep 28, 2019, 3:37 AM
[10]
Citation Linkwww.pw.utc.comPratt & Whitney R-1690 page
Sep 28, 2019, 3:37 AM
[11]
Citation Linken.wikipedia.orgThe original version of this page is from Wikipedia, you can edit the page right here on Everipedia.Text is available under the Creative Commons Attribution-ShareAlike License.Additional terms may apply.See everipedia.org/everipedia-termsfor further details.Images/media credited individually (click the icon for details).
Sep 28, 2019, 3:37 AM