Created in 1917, the Liberty L-4 was a four-cylinder water-cooled inline aircraft engine developed in the United States during World War I. The Liberty L-4 was an experimental engine of 102 hp (76 kW), which was built by the Hudson Motor Car Company and primarily intended for use in training airplanes. Only two examples were produced, since other types of engines were available and already in production. While the engine was ground-tested, it is unknown if the L-4 was ever test-flown. The L-4 was created as part of a US aircraft engine development effort which also created the six-cylinder Liberty L-6, eight-cylinder Liberty L-8 and twelve-cylinder Liberty L-12.

Liberty L-4
Liberty L-4 aircraft engine
Type	Piston aero engine
National origin	United States
Manufacturer	Hudson Motor Car Company
Designed by	Jesse G. Vincent and Elbert J. Hall
First run	1917
Number built	2
Variants	Liberty L-6, Liberty L-8, Liberty L-12

Specifications

General characteristics

• Type: Four-cylinder inline piston engine
• Bore: 5 in. (127mm)
• Stroke: 7 in. (177.8mm)
• Displacement: 549.8 cuin (9.0 L)

Components

• Cooling system: Water-cooled

Performance

• Power output: 102 hp (76 kW)

See also

Related lists

• List of aircraft engines

References

Wikimedia Commons has media related to Liberty L-4.

This article incorporates text from Liberty L-4, a public domain work of the United States Government.

• Gunston, Bill (1986). World Encyclopedia of Aero Engines. Wellingborough: Patrick Stephens. p. 106.

This aircraft engine article is missing some (or all) of its specifications. If you have a source, you can help Wikipedia by adding them.