Beardmore 120 hp

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

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.

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

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

Bibliography

• Gunston, Bill. World Encyclopaedia of Aero Engines. Cambridge, England. Patrick Stephens Limited, 1989. ISBN 1-85260-163-9
• Lumsden, Alec. British Piston Engines and their Aircraft. Marlborough, Wiltshire: Airlife Publishing, 2003. ISBN 1-85310-294-6.