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Pobjoy R

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Pobjoy R

The Pobjoy R was a British seven-cylinder, air-cooled, aircraft engine designed and built by Pobjoy Airmotors. Introduced in 1926 it was a popular engine for ultralight and small aircraft in the 1930s. A notable feature of the Pobjoy R was the propeller reduction gear which allowed the small engine to operate at more desirable higher speeds.

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Engines on display

A preserved Pobjoy R engine is on display at the Shuttleworth Collection, Old Warden, Bedfordshire. Two Pobjoy R engines, one installed on the remains of R222 (LV-FBA) Comper swift will be soon on display at the National Aviation Museum (Argentina-Moron-Buenos Aires Province)

Specifications (Pobjoy R)

Data from Lumsden.

General characteristics

  • Type: 7-cylinder air-cooled, radial, left-hand tractor
  • Bore: 3.03 in (77 mm)
  • Stroke: 3.43 in (87 mm)
  • Displacement: 173.05 cu in (2.84 L)
  • Diameter: 25.5 in (647.7 mm)
  • Dry weight: 135 lb

    • Components

  • Oil system: Dry sump
  • Cooling system: Air-cooled

    • Performance

  • Power output: 85 hp
  • Specific power: 0.5 hp/cu in
  • Fuel consumption: 4.9 imp. gallons per hour
  • Power-to-weight ratio: 0.63 hp/lb

    • References

    Pobjoy R Wikipedia
    (Text) CC BY-SA


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