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Pratt & Whitney R-1830 Twin Wasp

 

  Pratt-Twin-Wasp

 

First run in 1932, 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, 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. An enlarged version with a slightly higher power rating 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: 600 hp (447 kW), 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-1830-76: 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) Swedish unit built under license by SFA company for Finnish VL Myrsky II

 

Applications:
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
Fokker D.XXI-4
Grumman F4F Wildcat
Lioré et Olivier LeO 453
Lisunov Li-3 - A Yugoslav version of the Soviet Lisunov Li-2
Martin Maryland
Republic P-43 Lancer
Saab 17
Saab 18
Short Sunderland V
Seversky P-35
Vickers Wellington IV
VL Myrsky
Vultee P-66 Vanguard

 

Specifications:
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 (30 l)
Length: 59.06 in (1,500 mm)
Diameter: 48.03 in (1,220 mm)
Dry weight: 1,250 lb (567 kg)
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
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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