The Pratt & Whitney R-4360 is a large, air-cooled, radial aircraft engine that was developed in the late 1940s. It features a unique 28-cylinder design arranged in four rows, making it one of the largest piston engines ever produced. The R-4360 was primarily used in military and civilian aircraft during the 1950s. This engine is known for its high power output, reaching up to 3,000 horsepower. It powered several notable aircraft, including the Convair B-36 Peacemaker and the Lockheed Constellation. The R-4360's advanced engineering contributed to its reputation for reliability and performance in aviation history.