ABC Hornet

The ABC Hornet was an 80 hp (90 kW) four-cylinder aero engine designed in the late 1920s by the noted British engineer Granville Bradshaw for use in light aircraft. The Hornet was effectively a double Scorpion and was built by ABC Motors, first running in 1929.^[1]

Hornet
Type	Flat engine
National origin	United Kingdom
Manufacturer	ABC Motors Limited
Designer	Granville Bradshaw
First run	1929
Developed from	ABC Scorpion

In 1931 the engine was re-designed, including the adoption of the new Hiduminium alloys for the crankcase, exhaust manifolds and pistons.^[2]

Applications

• Airship Development AD1
• Civilian Coupe
• Robinson Redwing
• Southern Martlet
• Westland Widgeon

Specifications (Hornet)

Data from Lumsden^[3]

General characteristics

• Type: 4-cylinder, horizontally opposed, air-cooled piston engine
• Bore: 4.02 in (102 mm)
• Stroke: 4.8 in (124.5 mm)
• Displacement: 243.18 cu in (4 L)
• Length: 25.5 in (648 mm)
• Width: 39 in (990 mm)
• Height: 28 in (711 mm)
• Dry weight: 225 lb (102 kg)

Components

• Valvetrain: Overhead valve, two valves per cylinder
• Fuel type: Petrol (74 Octane rating)
• Cooling system: Air cooled

Performance

• Power output: 82 hp (61 kW) at 2,175 rpm (maximum continuous climb power)
• Specific power: 0.34 hp/cu in (15.25 kW/L)
• Compression ratio: 5.6:1
• Power-to-weight ratio: 0.37 hp/lb (0.6 kW/kg)

See also

• ABC motorcycles

Related development

• ABC Scorpion

Comparable engines

• Continental A-40

Related lists

• List of aircraft engines