Pratt & Whitney R-1830 Twin Wasp

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 Grumman F4F Wildcat Consolidated PBY Catalina
Number built	173,618 ^[1]
Variants	Pratt & Whitney R-2000 Twin Wasp

The Pratt & Whitney R-1830 Twin Wasp was an American aircraft engine widely used in the 1930s and 1940s. Produced by Pratt & Whitney, it was a two-row, 14-cylinder, air-cooled radial design. It displaced 1,830 cu in (30.0 L) and its bore and stroke were both 5.5 in (140 mm). A total of 173,618 R-1830 engines was built,^[1] and from their use in two of the most-produced aircraft ever built, the B-24 bomber and 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.

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: 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

Bristol Beaufort (Australian-built production)
Bloch MB.176
Burnelli CBY-3
CAC Boomerang
CAC Woomera
Consolidated B-24 Liberator
Consolidated PBY Catalina
Consolidated PB2Y Coronado
Consolidated PB4Y Privateer
Curtiss P-36 Hawk
Douglas C-47 Skytrain
Douglas DC-3
Douglas DB-7 (early variants only)
Douglas TBD Devastator
FFVS J 22
Grumman F4F Wildcat
Laird-Turner Meteor LTR-14
Lioré et Olivier LeO 453
Lisunov Li-3 - A Yugoslav version of the Soviet Lisunov Li-2
Martin Maryland
Restored Mitsubishi A6M Zero warbird aircraft
Republic P-43 Lancer
Saab 17
Saab 18
Short Sunderland V
Seversky P-35
Vickers Wellington IV
VL Myrsky
Vultee P-66 Vanguard

Engines on display

Model R-1830-92 displayed at the Smithsonian Institution's National Air and Space Museum in Washington, DC^[2]
Model R-1830-86 on display at the New England Air Museum, Bradley International Airport, Windsor Locks, CT.^[3]
Model R-1830 on display at the Northeast Classic Car Museum in Norwich, NY

Model R-1830 on display at the dutch aviation museum Aviodrome

Specifications (R-1830-S1C-G)

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

Data from ^[4]

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

Valvetrain: Two overhead valves per cylinder
Supercharger: Single-speed General Electric centrifugal type supercharger, 1:7.15 speed increase
Fuel system: Two-barrel Stromberg carburetor
Fuel type: 95-100 octane rating gasoline
Cooling system: Air-cooled
Reduction gear: Epicyclic gearing, 2:3

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)

References

1 2 - Manufacturer's product page, R-1830 Retrieved: 2 November 2013
↑ Collection: Pratt & Whitney Twin Wasp R-1830-92 Radial Engine Retrieved: 3 December 2014
↑ New England Air Museum Exhibit page R-1830-86 Twin Wasp Retrieved: 2 November 2013
↑ 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.

Angelucci, Enzo (1988, Revised Edition 2006). Complete Book of World War II Combat Aircraft. VMB Publishers. ISBN 978-88-540-0829-8. Check date values in: |date= (help)
Bridgman, Leonard, ed. Jane's All The World's Aircraft 1951–1952. London: Samson Low, Marston & Company, Ltd 1951.

External links

Wikimedia Commons has media related to Pratt & Whitney R-1830.

Pratt & Whitney's R-1830 page

Pratt & Whitney aircraft engines

Radial engines	R-985 R-1340 R-1535 R-1690 R-1830 R-1860 R-2000 R-2060 R-2180-A R-2180-E R-2270 R-2800 R-4360 Double Wasp Hornet (A) Hornet B Twin Hornet Twin Wasp (R-1830) Twin Wasp (R-2000) Twin Wasp E Twin Wasp Junior Wasp series Wasp Wasp Junior Wasp Major Yellow Jacket

H piston engines	X-1800/XH-2600 XH-3130 (XH-3730)

Free-piston gas turbines	PT1

Turbojets	JT3C JT4 JT6 JT7 JT8A JT9 JT11 JT12 J42 J48 J52 J57 J58 J60 J75 J91

Turbofans	GP7000† JT3D JT4D JT8D JT9D JTF10 JTF10A JT10D JTF14 JTF16 JTF17 JTF22 PW1000G PW1120 PW2000 PW4000 PW5000 PW6000 STF200 SuperFan† V2500† F100 F105 F117 F119 F135 F401 TF30 TF33 RM8

Turboprops/Turboshafts	APW34† JFTD12 PT2 PT3 PT4 PT5 T34 XT45 T52 XT57 T73 T800-APW†

Propfans	578-DX†

Rocket engines	RL10

Aeroderivative gas turbine engines	GG3/FT3 GG4/FT4 FT8

Subsidiaries	Pratt & Whitney Canada Pratt & Whitney Rocketdyne

Key people	Leonard S. Hobbs George J. Mead Wright Parkins Perry Pratt Frederick Rentschler Richard "Dick" Soderberg Andrew Willgoos

† Joint development aeroengines

United States military piston aircraft engine designation system

H (four-bank H-configuration inline)	H-1640 XH-2240 H-2470 XH-2600 XH-3130 XH-3730 H-4070

I (inverted-V inline)	IV-1430 IV-2040 IV-2220

L (single-bank inline)	L-330 L-365 L-375 L-390 L-410 L-440 L-510 L-825

O (opposed)	O-15 O-40 O-45 O-90 O-100 O-145 O-150 O-170 O-175 O-180 O-190 O-200 (C) O-200 (F) O-205 O-235 O-290 O-300 O-335 O-360 (C) O-360 (L) O-405 O-425 O-435 O-470 O-480 O-520 O-540 (F) O-540 (L) O-550 O-580 O-805 O-1230

R (radial)	R-250 R-265 R-270 R-370 (LB) R-370 (K) R-420 R-440 R-500 R-540 (W) R-540 (K) R-545 R-550 R-600 R-670 R-680 R-720 R-755 R-760 R-790 R-830 R-915 R-975 DR-980 R-985 R-1044 R-1300 R-1340 R-1454 R-1510 R-1535 R-1640 R-1670 R-1690 R-1750 R-1820 R-1830 R-1860 R-2000 R-2060 R-2160 R-2180 R-2600 R-2800 R-3350 R-4090 R-4360 XR-7755

V (upright-V inline)	V-720 V-770 V-1150 V-1237 V-1400 V-1410 V-1440 V-1460 V-1510 V-1560 V-1570 V-1650 (L) V-1650 (P) V-1710 V-1950 V-3420

W (three-bank W-configuration inline)	W-2779

See also: X-1800 US military gas turbine aeroengines Piston engine configurations

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