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 R-1690 Hornet jaypee
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


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)

Pratt & Whitney R-1690 Hornet with cutaways detail
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

Chris Pratt

Christopher Michael Pratt (born June 21, 1979) is an American actor. He rose to prominence for his television roles, particularly as Andy Dwyer in the NBC sitcom Parks and Recreation (2009–2015), for which he received critical acclaim and was nominated for the Critics' Choice Television Award for Best Supporting Actor in a Comedy Series in 2013. He also starred earlier in his career as Bright Abbott in The WB drama series Everwood (2002–2006) and had roles in Wanted (2008), Jennifer's Body (2009), Moneyball (2011), The Five-Year Engagement (2012), Zero Dark Thirty (2013), Delivery Man (2013), and Her (2013).

Pratt achieved leading man status in 2014 after starring in two critically and commercially successful films, Warner Animation Group's The Lego Movie as Emmet Brickowski and Marvel Studios' Guardians of the Galaxy as Star-Lord. In 2015, he starred in Jurassic World, the fourth installment in the Jurassic Park franchise, which was his most financially successful film up until the release of Avengers: Infinity War, and later Avengers: Endgame; he reprised the former role in the sequel Jurassic World: Fallen Kingdom in 2018. In 2015, Time named Pratt one of the 100 most influential people in the world on the annual Time 100 list.Pratt continued his leading man run in 2016 with The Magnificent Seven and Passengers. He reprises his role as Star-Lord in the Marvel Cinematic Universe in Guardians of the Galaxy Vol. 2 (2017), Avengers: Infinity War (2018) and Avengers: Endgame (2019).

Radial engines
H piston engines
Free-piston gas turbines
Rocket engines
Aeroderivative gas
turbine engines
Key people
Piston engines
Turbine engines
H (four-bank
H-configuration inline)
I (inverted-V inline)
L (single-bank inline)
O (opposed)
R (radial)
V (upright-V inline)
W (three-bank
W-configuration inline)


This page is based on a Wikipedia article written by authors (here).
Text is available under the CC BY-SA 3.0 license; additional terms may apply.
Images, videos and audio are available under their respective licenses.