The Pratt & Whitney R-2800 is a double-row, air-cooled radial engine that was first introduced in the late 1930s. It features 18 cylinders arranged in two rows, providing a displacement of 2,800 cubic inches. Known for its reliability and power, the R-2800 became one of the most widely used aircraft engines during World War II. This engine powered numerous aircraft, including the Vought F4U Corsair and the Douglas A-26 Invader. With a maximum output of around 2,000 horsepower, the R-2800 contributed significantly to the performance of these planes, making it a key component in military aviation history.