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Pratt & Whitney R-2000 Twin Wasp

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Radial aircraft engine

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R-2000 Twin Wasp
A preserved R-2000 Twin Wasp
Type	Radial engine
National origin	United States
Manufacturer	Pratt & Whitney
First run	1942
Major applications	C-54 Skymaster Douglas DC-4 de Havilland Canada DHC-4 Caribou
Developed from	Pratt & Whitney R-1830 Twin Wasp

ThePratt & Whitney R-2000 Twin Wasp is an American radial engine developed in 1942 to power military aircraft. It is one of thePratt & Whitney Wasp series ofradial engines.

Design and development

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The R-2000 was an enlarged version of thePratt & Whitney R-1830 Twin Wasp, with focus on reducing the manufacturing costs and fuel requirements. Thebore was increased to 5.75 in (146 mm), while it still retained the 5.5 in (140 mm) stroke. This brought displacement up to 2,000 in³ (32.8 L). There were a number of detail changes from the R-1830, such as front-mounted instead of rear-mountedmagnetos (as with the larger, and earlierDouble Wasp), plain bearings for the crankshaft rather than roller bearings, and 87 octane fuel (specified because there were fears wartime supplies of 100 octane might fall short, but those fears were groundless).

The R-2000 produced 1,300 hp (970 kW) at 2,700 rpm with 87 octane fuel, 1,350 hp (1,010 kW) with 100 octane fuel and 1,450 hp (1,080 kW) at 2,800 rpm with 100/130-grade fuel.^[1]

Applications

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Specifications (R-2000 2SD1-G)

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R-2000 mounted on the wing of a Douglas DC-4

Data fromAircraft Engines of the World^[2]

General characteristics

Type: Twin-rowradial engine, 14cylinder
Bore: 5.75 in (146.05 mm)
Stroke: 5.5 in (139.7 mm)
Displacement: 2,004 in³ (32.84 L)
Length: 60.7 in (1,540 mm)
Diameter: 49.5 in (1,260 mm)
Dry weight: 1,590 lb (720 kg)

Components

Supercharger: 2-speed
Fuel system:Stromberg carburetor
Fuel type: 100/130grade gasoline
Cooling system:Air-cooled
Reduction gear: 2:1

Performance

Power output:
- 1,450 hp (1,080 kW) at 2,700rpm (take-off rating)
- 1,450 hp (1,080 kW) at 2,700 rpm at 1,000 ft (300 m) (low-altitude military rating)
- 1,100 hp (820 kW) at 2,700 rpm at 16,000 ft (4,900 m) (high-altitude military rating)
- 1,100 hp (820 kW) at 2,550 rpm at 7,500 ft (2,300 m) (low-altitude normal rating)
- 1,000 hp (750 kW) at 2,550 rpm at 17,000 ft (5,200 m) (high-altitude normal rating)
- 735 hp (548 kW) at 2,230 rpm at 14,700 ft (4,500 m) (cruise rating)
- 700 hp (520 kW) at 2,150 rpm at 2,150 ft (660 m) (cruise rating)
Compression ratio: 6.5:1

References

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Wikimedia Commons has media related toPratt & Whitney R-2000.

Notes

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^White (1995), p. 221.
^Wilkinson (1945), p. 137.

Bibliography

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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
Wilkinson, Paul H.Aircraft Engines of the World 1945. 3rd edition, New York: Paul H. Wilkinson, 1945.

v t e 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 JT4A 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 PW7000 PW9000 RTF-180† STF200 SuperFan† V2500† F100 F105 F117 F119 F135 F401 RM8† TF30 TF33 XA101 XA103
Turboprops/Turboshafts	APW34† JFTD12 PT2 PT3 PT4 PT5 T34 XT45 T52 XT57 T73 T800-APW† T900†
Propfans	578-DX†
Rocket engines	RL10 XLR-129
Aeroderivative gas turbine engines	FT3 FT4 FT8 FT9 FT12
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 See also:Pratt & Whitney Canada aeroengines

v t e United States military piston aircraft enginedesignation system
H (four-bank H-configuration inline)	H-1640 XH-2240 XH-2470 XH-2600 XH-3130 XH-3730 H-4070
IV (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-1150 V-1237 V-1400 V-1440 V-1460 V-1510 V-1560 V-1570 V-1650 (P) V-1710 V-1950 V-3420
V (inverted-V inline)	V-770 V-1650 (L)
VG (inverted-V inline)	VG-1410
W (three-bank W-configuration inline)	W-2779
See also:X-1800 US military gas turbine aeroengines Piston engine configurations