The Liberty L-12 is a V12 aircraft engine developed during World War I by the United States. It was designed to provide reliable power for military aircraft, significantly improving performance compared to earlier engines. The L-12 produced around 400 horsepower and was known for its durability and efficiency. This engine played a crucial role in the war, powering various aircraft, including the Liberty JN-4 and the De Havilland DH-4. Its design influenced future aviation technology, making it a significant milestone in the development of aircraft engines. The Liberty L-12 is often regarded as a symbol of American engineering during the early 20th century.