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Pratt & Whitney R-1830

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 measured 5.5 and 5.5 in (140 and 140 mm), respectively. A total of 173,618 R-1830 engines were built. An enlarged version with a slightly higher power rating was produced as the R-1830.

Specifications: (for R-1830-S1C-G)

Type: two-row, 14-cylinder, air-cooled radial Manufacturer: Pratt & Whitney

First run: 1932 Number built: 173,618

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 (30 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, 7.15:1 reduction
  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)

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-1830-82 - 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

[Source - Wikipedia]

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