To install click the Add extension button. That's it.

The source code for the WIKI 2 extension is being checked by specialists of the Mozilla Foundation, Google, and Apple. You could also do it yourself at any point in time.

Kelly Slayton
Congratulations on this excellent venture… what a great idea!
Alexander Grigorievskiy
I use WIKI 2 every day and almost forgot how the original Wikipedia looks like.
Live Statistics
English Articles
Improved in 24 Hours
Added in 24 Hours
What we do. Every page goes through several hundred of perfecting techniques; in live mode. Quite the same Wikipedia. Just better.

Wright R-2600 Twin Cyclone

From Wikipedia, the free encyclopedia

Wright R-2600 1.jpg
Wright R-2600 Cyclone radial engine
Type Radial engine
National origin United States
Manufacturer Wright Aeronautical
First run 1935
Major applications
Number built >50,000
Developed from Wright R-1820

The Wright R-2600 Cyclone 14 (also called Twin Cyclone) is an American radial engine developed by Curtiss-Wright and widely used in aircraft in the 1930s and 1940s.


In 1935, Curtiss-Wright began work on a more powerful version of their successful R-1820 Cyclone 9. The result was the R-2600 Twin Cyclone, with 14 cylinders arranged in two rows. The 1,600 hp (1,200 kW; 1,600 PS) R-2600-3 was originally intended for the C-46 Commando (being fitted to the prototype CW-20A). It was also the original engine choice for the F6F Hellcat; a running change (one which would not stop production) for the CW-20A, and one in late April 1942 for the second XF6F-1, led to the adoption of the 2,000 hp (1,500 kW; 2,000 PS) Pratt & Whitney R-2800 Double Wasp in the R-2600's place for both designs.

The Twin Cyclone went on to power several important American World War II aircraft, including the A-20 Havoc, B-25 Mitchell, TBF Avenger, SB2C Helldiver, and the PBM Mariner.

Over 50,000 R-2600s were built at plants in Paterson, New Jersey, and Cincinnati, Ohio.


  • R-2600-1 - 1,600 hp (1,194 kW)
  • R-2600-2 - 1,500 hp (1,118 kW)- Prototype variant; Few were made.[1]
  • R-2600-3 - 1,600 hp (1,194 kW)
  • R-2600-4 - 1,650 hp (1,230 kW)[2]
  • R-2600-6 - 1,600 hp (1,194 kW)
  • R-2600-8 - 1,700 hp (1,268 kW)
  • R-2600-9 - 1,700 hp (1,268 kW)
  • R-2600-10 - 1,700 hp (1,268 kW)- Experimental high-altitude R-2600 variant with a two-stage mechanical supercharger, vice the usual single-stage supercharger. The 2600-10 also served as a testbed for turbo-supercharging the 2600 series. Very few were produced.[3][4]
  • R-2600-11 - 1,600 hp (1,194 kW)[5]
  • R-2600-12 - 1,700 hp (1,268 kW)
  • R-2600-13 - 1,700 hp (1,268 kW)
  • R-2600-14 - 1,700 hp (1,268 kW)- One of the engines which powered Grumman's prototype F6Fs, the XF6F-1 (the two-stage supercharged R-2600-10 was also tested in the XF6F-1). Grumman was not happy with the performance, which led to the 2,000 hp Pratt & Whitney R-2800 engine replacing the R-2600 on F6F production models.[6]
  • R-2600-15 - 1,800 hp (1,342 kW)- Planned to power the XB-33A, a prototype model of the B-33 Super Marauder (itself a high-altitude version of the B-26 Marauder). The project was cancelled, and neither the prototype XB-33A or production B-33A were ever built.[7]
  • R-2600-16 - 1,700 hp (1,268 kW)- Similar to the R-2600-10 & -14, the -16 powered a Grumman prototype F6F, the XF6F-2.[8]
  • R-2600-19 - 1,600 hp (1,194 kW), 1,660 hp (1,237 kW)
  • R-2600-20 - 1,700 hp (1,268 kW), 1,900 hp (1,420 kW)
  • R-2600-22 - 1,900 hp (1,420 kW)
  • R-2600-23 - 1,600 hp (1,194 kW)
  • R-2600-29 - 1,700 hp (1,268 kW), 1,850 hp (1,380 kW)
  • GR-2600-A5B - 1,500 hp (1,118 kW), 1,600 hp (1,194 kW), 1,700 hp (1,268 kW)
  • GR-2600-A71 - 1,300 hp (969 kW)
  • GR-2600-C14 - 1,750 hp (1,304 kW)


Wright R-2600 Cyclone being fitted to a North American B-25 Mitchell, at North American Aviation, Inglewood, California
Wright R-2600 Cyclone being fitted to a North American B-25 Mitchell, at North American Aviation, Inglewood, California
R-2600 on display at Museum of Aviation, Robins AFB
R-2600 on display at Museum of Aviation, Robins AFB

Specifications (GR-2600-C14BB)

Data from Jane's.[9]

General characteristics

  • Type: 14-cylinder supercharged air-cooled two-row radial engine
  • Bore: 6+18 in (155.6 mm)
  • Stroke: 6+516 in (160.3 mm)
  • Displacement: 2,604 cu in (42.7 L)
  • Length: 62.06 in (1,576 mm)
  • Diameter: 55 in (1,397 mm)
  • Dry weight: 2,045 lb (928 kg)



See also

Related development

Comparable engines

Related lists



  1. ^ Friedman, Norman (30 October 2016). Fighters Over the Fleet Naval Air Defence from Biplanes to the Cold War (1 ed.). Pen & Sword Books. p. 61. ISBN 9781848324060. The prototype R-2600-2, rated at 1,500hp for take-off ...
  2. ^ "Teesside Aviation News" (PDF) (Press release). Teesside, UK: Teesside Aviation Society. 1982-11-01. Retrieved 2021-04-06. ... for the RAF, 19 were experimentally fitted with R-2600-4-53 Cyclones ... engines of 1650 hp.
  3. ^ Francillon, Renè (1989). Grumman Aircraft Since 1929. Putnam Aeronautical. p. 196. ISBN 9780851778358. Retrieved 2021-04-03.
  4. ^ Grossnick, Roy (1995). "Appendix 1: Aircraft Data—Technical Information and Drawings". TBF/TBM Avenger (PDF). Dictionary of American Naval Aviation Squadrons. Vol. I: The History of VA, VAH, VAK, VAL, VAP, and VFA Squadrons. Washington Navy Yard, Washington D.C.: Naval Historical Center, Department of the Navy. p. 512. ISBN 0-945274-29-7. Retrieved 2021-04-03 – via Naval History and Heritage Command.
  5. ^ United States Civil Aeronautics Administration Aircraft Listing. United States Civil Aeronautics Administration. 1949. p. 68. Retrieved 2021-04-03.
  6. ^ Thomas, Cleaver (19 Oct 2017). "The Pacific Theater". Pacific Thunder The US Navy's Central Pacific Campaign, August 1943–October 1944 (1 ed.). Bloomsbury Publishing. p. 45. ISBN 9781472821867. The XF6F-1 was powered by the Wright R-2600 14- cylinder Twin Cyclone radial engine. After meeting O'Hare, Grumman suggested a power increase which ... put the super new Pratt & Whitney R-2800 ... in the second prototype.
  7. ^ Andrade 1979, p 51
  8. ^ Thruelsen 1976, p 193
  9. ^ Jane's 1998, p. 317.
  10. ^ Liss, Witold (1967). The Lavochkin La 5 & 7. Aircraft Profiles. Vol. Number 149. Leatherhead, Surrey, UK: Profile Publications. p. 3.


  • Andrade, John (1979). U.S.Military Aircraft Designations and Serials since 1909. Midland Counties Publications. ISBN 0 904597 22 9.
  • Bridgman, Leonard, ed. (1998). Jane's Fighting Aircraft of World War II. London: Studio Editions Ltd. ISBN 0-517-67964-7.
  • Gunston, Bill (2006). World Encyclopedia of Aero Engines: From the Pioneers to the Present Day (5th ed.). Stroud, UK: Sutton. ISBN 0-7509-4479-X.
  • Thruelsen, Richard (1976). The Grumman Story. New York: Praeger Publishers. ISBN 0-275-54260-2.
  • White, Graham (1995). Allied Aircraft Piston Engines of World War II: History and Development of Frontline Aircraft Piston Engines Produced by Great Britain and the United States During World War II. Warrendale, Pennsylvania: SAE International. ISBN 1-56091-655-9.

External links

Media related to Wright R-2600 at Wikimedia Commons

This page was last edited on 16 April 2022, at 19:24
Basis of this page is in Wikipedia. Text is available under the CC BY-SA 3.0 Unported License. Non-text media are available under their specified licenses. Wikipedia® is a registered trademark of the Wikimedia Foundation, Inc. WIKI 2 is an independent company and has no affiliation with Wikimedia Foundation.