Pratt & Whitney R-1830 Twin Wasp

The Pratt & Whitney R-1830 Twin Wasp is an American aircraft engine widely used in the 1930s and 1940s. Produced by Pratt & Whitney, it is a two-row, 14-cylinder, air-cooled radial design with seven cylinders on a row. It displaces 1,830 cu in (30.0 L) and its bore and stroke are both 5.5 in (140 mm). A total of 173,618 R-1830 engines were built,[1] and from their use in two of the most-produced aircraft ever built, the four-engined B-24 heavy bomber and twin-engined DC-3 transport, more Twin Wasps may have been built than any other aviation piston engine in history. A "bored-out" version (to a 5.75 inch/146 mm cylinder bore) with a slightly higher power rating and other slight changes in detail design was produced as the R-2000. Mostly retired today, it is still used on Douglas DC-3 and various museum aircraft and warbirds seen at airshows. It is not manufactured anymore, but spares are still available and there exists a wide market for second-hand engines and parts.

R-1830 Twin Wasp
R-1830 on display at the Imperial War Museum Duxford
Type Radial engine
National origin United States
Manufacturer Pratt & Whitney
First run 1932
Major applications Consolidated B-24 Liberator
Douglas C-47 Skytrain
Douglas DC-3
Grumman F4F Wildcat
Consolidated PBY Catalina
Number built 173,618 [1]
Variants Pratt & Whitney R-2000 Twin Wasp

Variants
  • R-1830-1: 800 hp (597 kW)
  • R-1830-9: 850 hp (634 kW), 950 hp (708 kW)
  • R-1830-11: 800 hp (597 kW)
  • R-1830-13: 900 hp (671 kW), 950 hp (708 kW), 1,050 hp (783 kW)
  • R-1830-17: 1,200 hp (895 kW)
  • R-1830-21: 1,200 hp (895 kW)
  • R-1830-25: 1,100 hp (820 kW)
  • R-1830-33: 1,200 hp (895 kW)
  • R-1830-35: 1,200 hp (895 kW) Fitted with GE B-2 turbosupercharger
  • R-1830-41: 1,200 hp (895 kW) Fitted with GE B-2 turbosupercharger
  • R-1830-43: 1,200 hp (895 kW)
  • R-1830-45: 1,050 hp (783 kW)
  • R-1830-49: 1,200 hp (895 kW)
  • R-1830-64: 850 hp (634 kW), 900 hp (671 kW)
  • R-1830-65: 1,200 hp (895 kW)
  • R-1830-66: 1,000 hp (746 kW), 1,050 hp (783 kW), 1,200 hp (895 kW)
  • R-1830-72: 1,050 hp (783 kW)
  • R-1830-75: 1,350 hp (1,007 kW)
  • R-1830-76: 1,200 hp (895 kW)
  • R-1830-82: 1,200 hp (895 kW)
  • R-1830-86: 1,200 hp (895 kW)
  • R-1830-88: 1,200 hp (895 kW)
  • R-1830-90: 1,200 hp (895 kW)
  • R-1830-90-B: 1,200 hp (895 kW)
  • R-1830-92: 1,200 hp (895 kW)
  • R-1830-94: 1,350 hp (1,007 kW)
  • R-1830-S1C3-G: 1,050 hp (783 kW), 1,200 hp (895 kW)
  • R-1830-S3C4-G: 1,200 hp (895 kW)
  • R-1830-S6C3-G: 1,100 hp (820 kW)
  • R-1830-SC-G: 900 hp (671 kW)
  • R-1830-SC2-G: 900 hp (671 kW), 1,050 hp (783 kW)
  • R-1830-SC3-G: 1,065 hp (749 kW) same engine built in Sweden as STWC-3G by SFA company for Swedish J 22, B 17 and B 18.

Applications
R-1830 mounted on the left wing of an ex-military Douglas C-47
RAF Dakota's Twin Wasp out for servicing

Engines on display

Specifications (R-1830-S1C-G)
Pratt & Whitney R-1830 "Twin Wasp" (sectioned)

Data from [5]

General characteristics

  • Type: Fourteen-cylinder two-row supercharged air-cooled radial engine
  • Bore: 5.5 in (139.7 mm)
  • Stroke: 5.5 in (139.7 mm)
  • Displacement: 1,829.4 in³ (29.978 l)
  • Length: 59.06 in (1,500 mm)
  • Diameter: 48.03 in (1,220 mm)
  • Dry weight: 1,250 lb (567 kg)

Components

Performance

  • Power output:
  • 1,200 hp (895 kW) at 2,700 rpm for takeoff
  • 700 hp (522 kW) at 2,325 rpm cruise power at 13,120 ft (4,000 m)
  • Specific power: 0.66 hp/in³ (29.83 kW/l)
  • Compression ratio: 6.7:1
  • Specific fuel consumption: 0.49 lb/(hp•h) (295 g/(kW•h))
  • Power-to-weight ratio: 0.96 hp/lb (1.58 kW/kg)
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See also

Related development

  • Pratt & Whitney Wasp series
  • Pratt & Whitney R-985 Wasp Junior
  • Pratt & Whitney R-1340 Wasp
  • Pratt & Whitney R-1535 Twin Wasp Junior
  • Pratt & Whitney R-2000 Twin Wasp
  • Pratt & Whitney R-2800 Double Wasp
  • Pratt & Whitney R-4360 Wasp Major

Comparable engines

Related lists

References

Notes
  1. - Archived (Nov. 11, 2013) manufacturer's product page, R-1830 Retrieved: 7 February 2019
  2. Collection: Pratt & Whitney Twin Wasp R-1830-92 Radial Engine Retrieved: 3 December 2014
  3. New England Air Museum Exhibit page R-1830-86 Twin Wasp Retrieved: 2 November 2013
  4. "Arizona Commemorative Air Force Museum | Flying Tours | AZCAF".
  5. 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 24 March 2009.

Bibliography
  • Angelucci, Enzo (2006) [1988]. Complete Book of World War II Combat Aircraft. VMB Publishers. ISBN 978-88-540-0829-8.
  • Bridgman, Leonard, ed. Jane's All The World's Aircraft 1951–1952. London: Samson Low, Marston & Company, Ltd 1951.
  • Gunston, Bill. World Encyclopedia of Aero Engines: From the Pioneers to the Present Day. 5th edition, Stroud, UK: Sutton, 2006.ISBN 0-7509-4479-X
  • White, Graham. 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, 1995. ISBN 1-56091-655-9

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