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Pratt & Whitney R-1830 Twin Wasp

1932 14-cylinder radial piston engine family by Pratt & Whitney

Field	Value
name	R-1830 Twin Wasp
image	R-1830 IWM.JPG
caption	R-1830 on display at the Imperial War Museum Duxford
engine_type	Radial engine
manufacturer	Pratt & Whitney
national_origin	United States
first_run	1932
major_applications
number_built	173,618
variants_with_their_own_articles	Pratt & Whitney R-2000 Twin Wasp

The Pratt & Whitney R-1830 Twin Wasp is an American air-cooled radial aircraft engine. It has 14 cylinders, arranged in two rings of seven. It displaces 1830 cuin and its bore and stroke are both 5.5 in. The design traces its history to 1929 experiments at Pratt & Whitney on twin-row designs. Production began in 1932 and it was widely used during the 1930s.

It was selected as the power plant for both the four-engined Consolidated B-24 Liberator heavy bomber and the twin-engined Douglas DC-3 transport, two of the most-produced aircraft. The production run of 173,618 R-1830 examples makes it the most-produced aviation engine in history.

A further developed version, the R-2000, was produced starting in 1942. The R-2000 was "bored-out" to 5.75 in and had a number of other minor changes to improve fuel economy and allow it to run at higher power ratings on lower-octane fuel. The primary user of the R-2000 was the Douglas DC-4.

Mostly retired today, the R-1830 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 is still a market for second-hand engines and parts.

Variants

R-1830-1: 800 hp
R-1830-9: 850 hp, 950 hp
R-1830-11: 800 hp
R-1830-13: 900 hp, 950 hp, 1050 hp
R-1830-17: 1200 hp
R-1830-21: 1200 hp
R-1830-25: 1100 hp
R-1830-33: 1200 hp
R-1830-35: 1200 hp Fitted with GE B-2 turbosupercharger
R-1830-41: 1200 hp Fitted with GE B-2 turbosupercharger
R-1830-43: 1200 hp
R-1830-45: 1050 hp
R-1830-49: 1200 hp
R-1830-64: 850 hp, 900 hp
R-1830-65: 1200 hp
R-1830-66: 1000 hp, 1050 hp, 1200 hp
R-1830-72: 1050 hp
R-1830-75: 1350 hp
R-1830-76: 1200 hp
R-1830-82: 1200 hp
R-1830-86: 1200 hp
R-1830-88: 1200 hp
R-1830-90: 1200 hp
R-1830-90-B: 1200 hp
R-1830-92: 1200 hp
R-1830-94: 1350 hp
R-1830-S1C3-G: 1050 hp, 1200 hp
R-1830-S3C4-G: 1200 hp
R-1830-S6C3-G: 1100 hp
R-1830-SC-G: 900 hp
R-1830-SC2-G: 900 hp, 1050 hp
R-1830-SC3-G: 1065 hp 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

Bloch MB.176
Boeing XB-15
Budd RB Conestoga
Burnelli CBY-3
CAC Boomerang – Australian "emergency fighter"
CAC Woomera
Consolidated B-24 Liberator
Consolidated PBY Catalina
Consolidated PB2Y Coronado
Consolidated PB4Y Privateer
Curtiss P-36 Hawk
DAP Beaufort – Australian-built variants of Bristol Beaufort
Douglas C-47 Skytrain
Douglas DC-3
Douglas DB-7 – early variants only
Douglas TBD Devastator
FFVS J 22 – "emergency fighter"; built in-house by the Swedish Air Force
Grumman F4F Wildcat
I.Ae. 24 Calquin
Laird-Turner Meteor LTR-14
Lioré et Olivier LeO 453
Lockheed Model 18 Lodestar
Lisunov Li-3 – a Yugoslav version of the Lisunov Li-2
Martin Maryland
Martin M-130
Republic P-43 Lancer
Saab 17
Saab 18
Short Sunderland V
Seversky P-35
Vickers Wellington IV
VL Myrsky – Finnish "emergency fighter"
Vultee P-66 Vanguard

Engines on display

Model R-1830-65 on display at the Museo Nacional de Aeronautica, Buenos Aires, Argentina
Model R-1830-86 on display at the New England Air Museum, Bradley International Airport, Windsor Locks, Connecticut.
Model R-1830-90C on display at the Dutch aviation museum Aviodrome
Model R-1830-92 displayed at the Smithsonian Institution's National Air and Space Museum in Washington, DC
Model R-1830 on display at the Northeast Classic Car Museum in Norwich, New York
Model R-1830 cut-away display at Airbase Arizona Museum in Mesa, Arizona

Specifications (R-1830-S1C-G)

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

and start a new, fully-formatted line with --

1200 hp at 2,700 rpm for takeoff
700 hp at 2,325 rpm cruise power at 13,120 ft (4,000 m) |power/weight=0.96 hp/lb

References

Notes

Bibliography

Gunston, Bill. World Encyclopedia of Aero Engines: From the Pioneers to the Present Day. 5th edition, Stroud, UK: Sutton, 2006.
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.

References

[https://web.archive.org/web/20131111025015/http://www.pw.utc.com/R1830_Twin_Wasp_Engine - Archived (Nov. 11, 2013) manufacturer's product page, R-1830] Retrieved: 7 February 2019
[http://neam.org/index.php?option=com_content&view=article&layout=edit&id=1074 New England Air Museum Exhibit page R-1830-86 Twin Wasp] Retrieved: 2 November 2013
link. (9 April 2016 Retrieved: 3 December 2014)
"Arizona Commemorative Air Force Museum | Flying Tours | AZCAF".
Tsygulev. (1939). "Aviacionnye motory voennykh vozdushnykh sil inostrannykh gosudarstv (Авиационные моторы военных воздушных сил иностранных государств)". Gosudarstvennoe voennoe izdatelstvo Narkomata Oborony Soyuza SSR.
"FAA TCDS A-669".

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