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Pratt & Whitney R-1340

The Pratt & Whitney R-1340 Wasp was an aircraft engine of the reciprocating type that was widely used in American aircraft from the 1920s onward. It was the Pratt & Whitney aircraft company's first engine, and the first of the famed Wasp series. It was a single-row, nine-cylinder, air-cooled, radial design, and displaced 1,344 cubic inches (22 L); bore and stroke were both 5.75 in (146 mm). A total of 34,966 engines were produced.

Specifications: (for R-1340-S1H1-G)

Type: Nine-cylinder single-row supercharged air-cooled radial
Manufacturer: Pratt & Whitney
First run: December 29, 1925
Number built: 34,966
General characteristics
  Type: 9-cylinder single-row
    supercharged air-cooled radial engine
  Bore: 5.75 in (146 mm)
  Stroke: 5.75 in (146 mm)

  Displacement: 1,344 in³ (22 l)
  Length: N/A
  Diameter: 51.75 in (1.314 m)
  Dry weight: 930 lb (422 kg)

Components
  Valvetrain: Two overhead valves per cylinder
  Supercharger: Single-speed centrifugal type
    supercharger, 1:10 step-up
  Fuel system: Two-barrel Stromberg carburetor
  Fuel type: 91 octane rating gasoline
  Cooling system: Air-cooled
  Reduction gear: 3:2

Performance
  Power output:
  - 600 hp (447 kW) at 2,250 rpm at 6,200 ft (1,890 m)
  Specific power: 0.45 hp/in³ (20.3 kW/L)
  Compression ratio: 6:1
  Specific fuel consumption: N/A
  Power-to-weight ratio: 0.65 hp/lb (1.05 kW/kg)

Variants

R-1340-7 - 450 hp (340 kW), 600 hp (450 kW)
R-1340-8 - 425 hp (317 kW)
R-1340-9 - 450 hp (340 kW), 525 hp (391 kW)
R-1340-16 - 550 hp (410 kW)
R-1340-17 - 525 hp (391 kW)
R-1340-19 - 600 hp (450 kW)
R-1340-19F - 600 hp (450 kW)
R-1340-21G - 550 hp (410 kW)
R-1340-22 - 550 hp (410 kW)
R-1340-23 - 575 hp (429 kW)
R-1340-30 - 550 hp (410 kW)
R-1340-31 - 550 hp (410 kW)
R-1340-33 - 600 hp (450 kW)
R-1340-48 - 600 hp (450 kW)
R-1340-49 - 600 hp (450 kW)
R-1340-AN1 - 550 hp (410 kW)
R-1340-AN2 - 550 hp (410 kW), 3:2 geared prop shaft
R-1340-B - 450 hp (340 kW)
R-1340-D - 500 hp (370 kW)
R-1340-S1D1 - 525 hp (391 kW)
R-1340-S1H1-G - 550 hp (410 kW)
R-1340-S3H1 - 600 hp (450 kW)
R-1340-T1D1 - 520 hp (390 kW)

[Source - Wikipedia]


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