The Pratt & Whitney R-1340 Wasp is an American aircraft engine used widely before and in the early stages of World War II. Introduced in 1925, it was the first engine produced by Pratt & Whitney and marked the beginning of the renowned Wasp series. This single-row, nine-cylinder, air-cooled radial engine had a displacement of 1,344 cubic inches (22 litres) and produced between 410 to 600 hp, depending on the variant. The R-1340 powered a wide range of aircraft, including the North American T-6 Texan, Boeing P-26 Peashooter, and Sikorsky H-19 helicopter. Its reliability and performance made it a favorite for both military and commercial aviation, contributing to numerous aviation milestones, such as Jimmy Doolittle's racing records and Amelia Earhart's historic flights.