The V-1650-1 is a liquid-cooled, V-type aircraft engine developed during World War II. It is a variant of the Rolls-Royce Merlin engine, specifically adapted for use in American military aircraft. This engine features a 12-cylinder configuration and is known for its reliability and power output, making it suitable for various fighter planes. Primarily used in the P-51 Mustang, the V-1650-1 contributed significantly to the aircraft's performance and speed. With a maximum output of around 1,490 horsepower, it allowed the Mustang to excel in long-range missions and dogfights, enhancing its reputation as one of the best fighters of the war.