Liberty L-4

The Liberty L-4B was an experimental water-cooled inline four-cylinder aircraft engine developed in the United States during World War I.^[1] The 102 hp (76 kW) engine was designed and manufactured by the Hudson Motor Car Company and was mainly intended for use in training airplanes.^[2] Only two examples of the L-4B were produced, since other types of engines were available and 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
Designer	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