Military Wiki
Liberty L-4
Liberty L-4 aircraft engine

The Liberty L-4 was a four-cylinder, water-cooled, inline engine for aircraft developed in the United States during World War I. The Liberty L-4 was an experimental engine of 102 hp, built by the Hudson Motor Car Company and intended primarily for use in training airplanes. Only two were produced since other types of engines were available and already in production. It is unknown if the L-4 was ever test-flown.


General characteristics

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


  • Cooling system: Water-cooled


  • Power output: 102 hp


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

This page uses Creative Commons Licensed content from Wikipedia (view authors).