The Liberty L-5 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 is part of the larger Liberty engine family, which was known for its robust construction and versatility. The L-5 engine produced approximately 300 horsepower and was used in several aircraft, including the P-51 Mustang and the B-24 Liberator. Its design allowed for easy maintenance and adaptability, making it a valuable asset for military aviation during its operational period.