Kinner B-5

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Kinner b-5.jpg
A Kinner B-5 on display at the Old Rhinebeck Aerodrome in New York, as used in their Fleet Finch biplane.
Type Radial engine
Manufacturer Kinner Airplane & Motor Corporation
Developed from Kinner K-5
Developed into Kinner R-5

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

Design and development[edit]

The B-5 was a development of the earlier K-5 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, 8.6 litre-displacement 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. 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.


Specifications (Kinner B-5)[edit]

General characteristics

  • Type: Five-cylinder, air-cooled, radial
  • Bore: 4 58in (117mm)
  • Stroke: 5 14in (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


See also[edit]

Related development
Comparable engines
Related lists