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Kinner B-5 / B-54



The Kinner B-5 was a popular five cylinder American radial engine for light general and sport aircraft of the 1930s.

The B-5 was a development of the earlier K-5 circa 1928, with slightly greater power and dimensions. The main change was the increase in cylinder bore from 108 mm (4.25 in) to 117 mm (4.625 in) and a corresponding increase in displacement from 372 cu in (6.1 liters ) to 441 cu in (7.2 liters ).

One difference the B-5 had from radial engines of other manufacturers was that each individual cylinder had its own camshaft, a system also used by the contemporary Soviet-built Shvetsov M-11 five cylinder radial, while most other radial engine designs used a "cam ring" for the same purpose, connected to every cylinder's valves.

The B-5 was a rough running but reliable engine and the B-5 and its derivatives were produced in the thousands, powering many World War II trainer aircraft, its military designation was R-440. The B-5 was followed by the R-5 and R-55.

Kinner B-5

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Kinner B-5
Type: Five-cylinder, air-cooled, radial
Bore: 4 5⁄8in (117mm)
Stroke: 5 1⁄4in (133.3mm)
Displacement: 441 cu in (7.2 liters)
Length: 19 in (482mm)
Diameter: 45⅜ in (1152 mm)
Height: 4.5 in (1,104.8mm)
Dry weight: 295 lb (134 kg)
Valvetrain: 1 Inlet and 1 Exhaust valve per cylinder, individual camshafts for each cylinder
Fuel system: 1 Stromberg Carburetor
Fuel type: 73 Octane
Cooling system: Air
Power output: 100 hp at 1810 rpm, 125 hp at 1,925 RPM max/89 hp at 1,725 RPM cruise
Compression ratio: 5.26:1
Power-to-weight ratio: 0.42 hp/lb at cruise



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