The Rolls-Royce Merlin is a British aircraft engine that was widely used during World War II. Known for its powerful performance, it was a V12 liquid-cooled engine that produced between 1,030 and 1,600 horsepower. The Merlin was instrumental in the success of several iconic aircraft, including the Supermarine Spitfire and the Avro Lancaster. Developed in the 1930s, the Merlin engine featured advanced technology for its time, such as a two-stage supercharger. Its reliability and efficiency made it a favorite among pilots and engineers, contributing significantly to the Allied air efforts during the war. The Merlin remains a symbol of British engineering excellence.