The Liberty Engine was a type of aircraft engine developed during World War I. It was a V-12 engine, meaning it had twelve cylinders arranged in a V shape, which allowed for greater power and efficiency. Designed by J. Walter Christie, the Liberty Engine was used in various military aircraft, contributing significantly to the war effort. This engine was notable for its innovative design and performance, producing around 400 horsepower. Its reliability and power made it a popular choice for the United States Army Air Service and other military branches. The Liberty Engine played a crucial role in advancing aviation technology during the early 20th century.