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Kinner C-5 / R-720


The Kinner C-5 was an American five cylinder radial engine for small general and sport aircraft of the 1930s. The C-5 was a development of the earlier R-5 with greater power and dimensions. The main change was the increase in cylinder bore from 128 mm (5.0 in) to 143 mm (5.625 in) and an increase in cylinder stroke from 140 mm (5.5 in) to 145 mm (5.75 in). This led to a corresponding increase in displacement from 8.85 liters (540 cu in) to 11.71 liters (715 cu in).

The U.S. military designation was R-720.


Consolidated YPT-11B
Kellett K-3
Kinner P
Stearman YPT-9C
Verville YPT-10D
Waco OSO
Waco OEC
Waco ODC
Waco OBF


Type: 5-cylinder air cooled radial
Bore: 5.625 in (143 mm)
Stroke: 5.75 in (145 mm)
Displacement: 715 cu in (11.71 liters)
Length: 34.8in (884 mm)
Diameter: 50 in (1,270 mm)
Dry weight: (dry) 420 lb (190 kg)
Valvetrain: 1 inlet and 1 exhaust valve per cylinder
Fuel system: 1 Stromberg carburetor
Fuel type: 73 octane
Cooling system: Air
Power output: maximum 245 hp at 2,200 rpm , cruise 210 hp at 1,900 rpm
Compression ratio: 5.25:1
Specific fuel consumption: 0.6 lb (273 gm) /hp/hr
Oil consumption: 0.015 lb (7 gm) /hp/hr





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