PlaneSpottingWorld welcomes all new members! Please gives your ideas at the Terminal.

Liberty L-12

From PlaneSpottingWorld, for aviation fans everywhere
See also Liberty L-8 for the eight-cylinder prototype & Lincoln Liberty engine

The Liberty L-12 was a 27 litre water-cooled 45 degree V-12 aircraft engine of 400 horsepower (300 kW).

It was designed by Jesse Vincent and E. J. Hall of the Hall-Scott Motor Co. and manufactured by Packard, Lincoln, Ford, Nordyke and Marmon, and General Motors during the First World War. It was a modular design where 4 or 6 cylinders could be used in one or two banks. 20,478 were built between 4 July 1917 and 1919. A single overhead camshaft for each cylinder bank operated 2 valves per cylinder, in a similar manner to the German Mercedes D.III inline six cylinder engine. Dry weight was 383 kg (844 lb). Two examples of a six-cylinder version, the Liberty L-6, were produced but not procured by the Army. Both were destroyed by Dr. William Christmas testing his so-called "Christmas Bullet" fighter.

An inverted Liberty 12-A was also referred to as the V-1650 and was built up to 1926—the exact same designation later applied, due to identical displacement, to the World War II Packard-built Rolls-Royce Merlin.

The engine was also produced in the United Kingdom] for tank use as the Nuffield Liberty and used extensively for that purpose

File:Liberty V12.jpg
Major Henry H. Arnold with first Liberty V12 engine completed.

Specifications (Liberty L-12)


Used In


  • Mark VIII - Anglo-American or Liberty (WWI)
  • BT-2 - Soviet (interwar)
  • Cruiser Mk III - British (WWII)
  • Cruiser Mk IV - British (WWII)
  • Crusader - British (WWII)
  • Centaur - early version of the British Cromwell (WWII)

cs:Liberty 12 de:Liberty (Motor) it:Liberty L-12 tr:Liberty L-12

This article is licensed under the GNU Free Documentation License.
It uses material from the Wikipedia article "Liberty L-12".