Kinner B-5

The Kinner 5-cylinder radial engine was the work of Bert Kinner in his Los Angeles design office in the 1920s. Kinner initially designed aircraft, but lacking a suitable engine constructed a lightweight reliable engine. The aircraft are now mostly forgotten, but his name is still associated with a successful line of radial aircraft engines. The first engines were 3-cylinder air-cooled radials, followed by a large number of five cylinder engines. The final engine was the 300 horsepower Kinner C-7.

Amelia Earhart flew early models of Kinner aircraft and later became a sales representative for Kinner.

The Kinner B-5 was a popular engine for light general and sport aircraft. The B-5 was a development of the earlier K-5 with slightly greater cylinder bore and a corresponding increase in power. 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 Museum’s Fleet Finch and Waco INF have a Kinner radial installed. In addition, a cutaway of the B-5 showing internal components is on display.

Technical Details:

Engine Type: 5-cylinder air-cooled radial
Power: 125 hp at 1925 RPM
Weight: 295 lb (134 kg)
Cylinder: bore 4 5/8 in (117 mm), stroke 5 ¼ in (133 mm)
Displacement: 441 cu in (7.2 litres)