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Kinner R-5 / R-53 / R-55 / R-56 / R-540


Kinner R-56 installed in a PT-22 Recruit


The Kinner R-5 is an American five cylinder radial engine for light general and sport aircraft of the 1930s. The R-5 was a development of the earlier Kinner B-5, with slightly greater power and dimensions. The main change was the increase in cylinder bore from 117 mm (4.625 in) to 127 mm (5 in) and an increase in cylinder stroke from 133.3 mm (5.25 in) to 139.7 mm (5.5 in). This led to a corresponding increase in displacement from 7.2 liters (441 cu in) to 8.8 liters (540 cu in). The R-5 was a rough running but reliable engine and the R-5 and its derivatives were produced in the 1,000s, powering many World War II trainer aircraft, its military designation R-540.


Kinner Sportwing
Kinner Playboy
Meyers OTW
N2T Tutor
Ryan PT-22 Recruit




Kinner R-5
Type: 5-cylinder air cooled radial
Bore: 5 in (127 mm)
Stroke: 5 1⁄2in (139.7 mm)
Displacement: 540cu in (8.85 L)
Length: 32.3in (820.4 mm)
Height: 45.6in (1,157 mm)
Dry weight: 330lb (149.6 kg)
Valvetrain: 1 inlet and 1 exhaust valve per cylinder
Fuel system: 1 Stromberg carburetor
Fuel type: 73 octane
Oil system: Dry sump
Cooling system: Air
Power output: 160hp at 1,850 RPM max/113hp at 1,800 RPM cruise
Compression ratio: 5.50:1
Power-to-weight ratio: 0.48 hp/lb



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