Kinner R-5

R-5
Kinner R-56 installed in a PT-22 Recruit
Type	Radial engine
Manufacturer	Kinner Airplane & Motor Corporation
Developed from	Kinner B-5
Developed into	Kinner C-5

The Kinner R-5 is an American five cylinder radial engine for light general and sport aircraft of the 1930s.

Design and development

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 piston 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. Thousands of the R-5 and its derivatives were produced, powering many World War II trainer aircraft. Its military designation was R-540.

Applications

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

Variants

R-5

R-53

R-55

R-56

Specifications (Kinner R-5)

General characteristics

• 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)

Components

• 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

Performance

• 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

See also

Related development

• Kinner B-5

Comparable engines

• Armstrong Siddeley Mongoose
• Shvetsov M-11
• Warner Super Scarab
• Wright R-540

Related lists

• List of aircraft engines

References

• http://www.oldengine.org/members/diesel/Duxford/usaero4.htm