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Pobjoy Airmotors Pobjoy R

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 engine to operate at high RPM.


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Pobjoy R
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
Oil system: Dry sump
Cooling system: Air-cooled
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






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