The Pratt & Whitney R-985 is a nine-cylinder, air-cooled radial engine that was first introduced in the 1930s. It has a displacement of 985 cubic inches and produces around 450 horsepower. This engine is known for its reliability and efficiency, making it popular in various aircraft, including military and civilian models. The R-985 engine was widely used in several aircraft, such as the Beechcraft Model 18 and the Fairchild PT-19. Its design features a simple construction, which contributes to its ease of maintenance. The R-985 remains a notable example of early aviation engineering.