The Liberty L-3 is a six-cylinder, air-cooled aircraft engine developed in the early 1940s. It was designed for use in various military aircraft during World War II, providing reliable performance and power. The engine has a displacement of 300 cubic inches and produces around 150 horsepower, making it suitable for light aircraft. This engine was part of the broader Liberty engine family, which included several models used in different applications. The L-3 was particularly noted for its simplicity and ease of maintenance, contributing to its popularity among pilots and mechanics during its operational period.