Blackburn Cirrus Bombardier

The Blackburn Cirrus Bombardier is a British four-cylinder inline aircraft engine, developed and built by the Blackburn Aircraft company in the mid-1950s. The engine featured fuel injection.

Cirrus Bombardier
Blackburn Bombardier 702 on display at the Rolls-Royce Heritage Trust, Derby
Type	Air-cooled 4-cylinder inline piston engine
National origin	United Kingdom
Manufacturer	Blackburn Aircraft
First run	c.1954

Variants

Cirrus Bombardier 203

Military version, 203 hp (151 kW).

Cirrus Bombardier 702

Civil version, 180 hp (134 kW).

Cirrus Bombardier 704

Helicopter engine

Applications

• Auster AOP.9
• Cierva W.14 Skeeter IIIB
• Miles Messenger

Specifications (Cirrus Bombardier 203)

Data from Lumsden.^[1]

General characteristics

• Type: Air-cooled, inline inverted four-cylinder
• Bore: 4.8 in (122 mm)
• Stroke: 5.5 in (140 mm)
• Displacement: 398 cu in (6.5 L)
• Length: 45.3 in (1,151 mm)
• Width: 19 in (483 mm)
• Height: 30.95 in (786 mm)
• Dry weight: 325 lb (147.4 kg)

Components

• Valvetrain: 1 inlet and 1 exhaust valve per cylinder
• Fuel system: Fuel injected
• Fuel type: 100 octane petrol
• Cooling system: Air-cooled

Performance

• Power output: 203 hp (151 kW) at 2,100 rpm
• Compression ratio: 7:1
• Power-to-weight ratio: 0.62 hp/lb (1 kW/kg)

See also

Related development

• Blackburn Cirrus Minor
• Blackburn Cirrus Major

Comparable engines

• Alfa Romeo 110
• de Havilland Gipsy Major
• Hirth HM 504
• Menasco C4

Related lists

• List of aircraft engines