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Blackburn Cirrus Major
Cirrus Major


Cirrus Major III installed in an Auster J/5G

The Blackburn Cirrus Major started as a development of the original ADC Cirrus series of aircraft engines which progressed through a number of variants, each with slightly different displacement and power outputs. First run in 1936, the Cirrus series was later bought by Cirrus Aero-Engines (later known as the Cirrus-Hermes Engine Company) which produced the Cirrus Hermes I, II, III and IV, again each differing slightly in displacement and power.
In 1934 Cirrus was bought again by the Blackburn Aircraft company and later that year the Cirrus Minor was produced. In 1935 the Cirrus Major entered production. Approximately 700 were built.


Cirrus Major I
135 hp
Cirrus Major II
148 hp variant.
Cirrus Major III
Higher compression engine with an increase in output to 150 hp (116kW).

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Cirrus Major I
Type: Inline air-cooled inverted 4-cylinder
Bore: 4.72 in (120 mm)
Stroke: 5.51 in (140 mm)
Displacement: 385.64 cu in (6.31 L)
Length: 50 in (1270 mm)
Width: 17.5 in (444 mm)
Height: 30 in (762 mm)
Dry weight: 310 lb (141 kg)
Valvetrain: 1 inlet and 1 exhaust valve per cylinder
Fuel system: 1 Claudel-Hobson carburettor
Fuel type: 73 octane petrol
Cooling system: Air-cooled
Power output: 135 hp (101 kW) at 2,350 rpm
Compression ratio: 5.1:1
Power-to-weight ratio: 0.43 hp/lb (0.71 kW/kg)



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