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Pratt and Whitney R 1830 Twin Wasp

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Pratt & Whitney R-1830 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, and from their use in two of the most-produced aircraft ever built, the four-engined B-24 heavy bomber and twin-engined 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.

Contents

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

  • Bristol Beaufort (Australian-built production)
  • Bloch MB.176
  • Budd RB Conestoga
  • 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
  • Model R-1830-86 on display at the New England Air Museum, Bradley International Airport, Windsor Locks, CT.
  • 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
  • Model R-1830/65 on display at the Museo Nacional de Aeronautica- Buenos Aires - Argentina

    • Specifications (R-1830-S1C-G)

    Data from

    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

    Pratt & Whitney R-1830 Twin Wasp Wikipedia
    (Text) CC BY-SA