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Motore aeronautico Blackburn Cirrus Bombardier
Anni '50



100

Description

The Bombardier engine was designed by the Cirrus Engine, a division of the British company Blackburn, starting from the end of the Second World War. The engine was produced in 300 units until the mid-1950s, mainly to equip the reconnaissance aeroplanes Auster AOP.9. The Cirrus Bombardier was one of the first British engines homologated for mass production to be equipped with a port-injection system, made by Skinner Union (SU). This allowed an increase in engine efficiency (lower specific consumption and about +25 hp) than the Cirrus Major III model with the same displacement. Despite it was designed for small airplanes, the engine has fine features, with a large use of light alloys, including the Elektron (a Magnesium alloy) for the crankcase and other structural parts.


Technical specifications

ManufacturerCirrus Engine, a divison of the Blackburn and General Aircraft Ltd, Brough, Yorkshire (UK), 1950s
TypeCirrus Bombardier
Descriptionaircraft engine with inverted 4-inline cylinders, Elektron-made crankcase with 5 main bearings, steel-made cylinders, headd and pistons in aluminium alloy
Stroke140 mm
Bore122 mm
Displacement6524 cm³
Compression ratio7.0
Power180 hp at 2600 rpm (max. output at sea level)
Specific fuel consumption220 g/hp/h
Specific power27.6 CV/litre
Valvetrain system2 overhead valves per cylinder controlled by an overhead gear-driven camshaft
Fuel feeding systemport-injection fed at 4.8 bar by a S.U. gasoline reciprocating pump
Ignition systemwith two spark plugs per cylinder fed by two BTH magneto distributors
Cooling systemair-fed
Lubrication systemforced by feeding and scavenge gear pumps
Length1151 mm
Width483 mm
Height786 mm
Weight159 kg
Mass-to-power ratio0.88 kg/hp


Application

Auster AOP.9 (reconnaissance)

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Realizzazione sito: Pasquale Pillitteri