The Beardmore 120 hp was a British six-cylinder, water-cooled aero engine that first ran in 1914, it was built by William Beardmore and Company as a licensed-built version of the Austro-Daimler 6. The engine featured cast iron cylinders and mild steel concave pistons. Produced between August 1914 and December 1918, the design powered many World War I aircraft types.[1]

120 hp
Preserved Beardmore 120 hp.
Type	Piston aero engine
Manufacturer	William Beardmore and Company
First run	c.1914
Major applications	Airco DH.1
Number built	400
Developed from	Austro-Daimler 6
Developed into	Beardmore 160 hp

Applications

• Airco DH.1
• Airco DH.3
• Armstrong Whitworth F.K.3
• Armstrong Whitworth F.K.8
• Bristol T.T.A.
• Cody V
• Martinsyde Elephant
• Royal Aircraft Factory F.E.2
• Royal Aircraft Factory R.E.5
• Royal Aircraft Factory R.E.7
• Vickers F.B.14
• White and Thompson No. 3

Specifications (120 hp)

Data from Lumsden[2]

General characteristics

• Type: 6-cylinder, inline, upright piston engine
• Bore: 5.12 in (130 mm)
• Stroke: 6.89 in (175 mm)
• Displacement: 851 cu in (13.145 L)
• Length: 57 in (1,148 mm)
• Width: 19.9 in (505 mm)
• Height: 31.9 in (810 mm)
• Dry weight: 545 lb (247 kg)

Components

• Valvetrain: Overhead valve
• Fuel type: Petrol
• Cooling system: Water-cooled
• Reduction gear: Direct drive, right-hand tractor

Performance

• Power output: 154 hp (115 kW) at 1,400 rpm (maximum power)
• Specific power: 0.18 hp/cu in (8.74 kw/L)
• Compression ratio: 4.85:1
• Power-to-weight ratio: 0.28 hp/lb (0.46 kW/kg)

See also

Related development

• Austro-Daimler 6
• Beardmore 160 hp

Comparable engines

• Benz Bz.IV
• Hiero 6
• Mercedes D.II
• Rolls-Royce Hawk

Related lists

• List of aircraft engines

References

Notes

Bibliography

External links

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