K-5
Kinner K-5 on display at the Pima Air & Space Museum
Type	Radial engine
National origin	United States of America
Manufacturer	Kinner Airplane & Motor Corporation
Developed into	Kinner B-5

The Kinner K-5 was a popular engine for light general and sport aircraft developed by Winfield B. 'Bert' Kinner.^[1] With the boom in civilian aviation after Charles Lindbergh's transatlantic flight the K-5 sold well. The K-5 was a rough running^{[citation needed]} but reliable engine and the K-5 and its derivatives were produced in the thousands, powering many World War II trainer aircraft. The K-5 was followed by the B-5, R-5 and R-55. Military engines were designated R-370

Applications

• Adcox Special
• American Eagle A-129 biplane
• Chamberlin C-2
• Davis D-1-K
• Fleet Model 2
• Granville Brothers Model A biplane
• Kinner Sportster
• Kreutzer Air Coach
• Simplex C-2 Red Arrow
• Sullivan Model K-3 Crested Harpy
• Waco KSO

Specifications (Kinner K-5)

Data from Jane's all the World's Aircraft 1928^[2]

General characteristics

• Type: Five-cylinder, air-cooled, radial
• Bore: 4.25 in (108 mm)
• Displacement: 372.4 cu in (6.103 L)
• Length: 19 in (480 mm)
• Diameter: 43.5 in (1,100 mm)
• Dry weight: 231 lb (105 kg)

Components

• Valvetrain: 1 inlet and 1 exhaust valve per cylinder
• Fuel system: 1 Stromberg carburetor or 1 double Zenith carburetor
• Fuel type: 73 Octane
• Oil system: pressure fed through hollow crankshaft
• Cooling system: Air

Performance

• Power output:
  
  • 100 hp (75 kW) at 1,810 rpm maximum
  • 70 hp (52 kW) at 1,650 rpm cruise
• Compression ratio: 5.0:1
• Fuel consumption: 7 gal/h (5.8 imp gal/h; 26 L/h)
• Oil consumption: 0.3125 gal/h (0.2602 imp gal/h; 1.183 L/h)
• Power-to-weight ratio: 0.36 hp/lb (0.59 kW/kg) at cruise