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Blackburn Cirrus Midget

The Blackburn Cirrus Midget was a British four-cylinder, inverted, in-line air-cooled aero engine designed and built in 1937 by the Cirrus Engine Section of Blackburn Aircraft Limited. Little is known of its development and use, its sole aircraft application is reported as the Chilton D.W.1 although it is possible that this did not transpire.

Cirrus Midget
Type: Inline air-cooled inverted 4-cylinder piston engine
Bore: 85 mm (3.35 in)
Stroke: 100 mm (3.94 in)
Displacement: 6.33 L (386.3 cu in)
Length: 33.6 in (853 mm)
Width: 14.18 in (360 mm)
Height: 21.65 in (550 mm)
Dry weight: 155 lb (70 kg)
Valvetrain: Overhead poppet valve, one inlet and one exhaust valve per cylinder
Fuel system: Single downdraught carburettor
Fuel type: 87 octane petrol
Cooling system: Air-cooled
Reduction gear: Direct drive, left hand tractor
Power output: 55 hp (41 kW) at 2,600 rpm (maximum power)
Specific power: 0.35 hp/cu in (6.5 kW/L)
Compression ratio: 6:1
Power-to-weight ratio: 0.35 hp/lb (0.58 kW/kg)



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