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

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.

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)