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Pratt & Whitney R-2800 Double Wasp

The Pratt & Whitney R-2800 Double Wasp is a two-row, 18-cylinder, air-cooled radial aircraft engine with a displacement of 2,804 in³ (46 L), and is part of the long-lived Wasp family.

The R-2800 is considered one of the premier radial piston engines ever designed and is notable for its widespread use in many important American aircraft during and after World War II. During the war years, Pratt & Whitney continued to develop new ideas to upgrade this already powerful workhorse, most notably water injection to give emergency power in combat.

Design & Development
Variants

Specifications: (for R-2800-54)

Type: 18-cylinder air-cooled two-row radial engine with water injection
Manufacturer: Pratt & Whitney
First run: 1937
Produced 1939 and 1960
Number built: 125,334

General characteristics
  Type: Eighteen-cylinder two-row
    air-cooled radial engine
  Bore: 5.75 in (146.05 mm)
  Stroke: 6 in (152.4 mm)

  Displacement: 2,804.5 in³ (45.96 L)
  Length: N/A
  Diameter: 52.8 in (1,342 mm)
  Dry weight: 2,360 lb (1,073 kg)

Components
  Valvetrain: Poppet, two valves per cylinder
  Supercharger: Variable-speed single-stage single-speed centrifugal type supercharger
  Fuel system: One Stromberg injection carburETOr
  Fuel type: 100/130 octane gasoline
  Cooling system: Air-cooled
  Reduction gear: N/A

Performance
  Power output: 2,100 hp (1,567 kW) @ 2,700 rpm
  Specific power: 0.75 hp/in³ (34.1 kW/L)
  Compression ratio: N/A
  Specific fuel consumption: N/A
  Power-to-weight ratio: 0.89 hp/lb (1.46 kW/kg)


Sources:
Wikipedia
Pratt & Whitney


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