The Rolls-Royce Kestrel was a British aircraft engine developed in the 1920s. It was a V-12 liquid-cooled engine known for its reliability and power, making it suitable for various military aircraft during its time. The Kestrel was one of the first engines to use a supercharger, which improved its performance at higher altitudes. This engine powered several notable aircraft, including the Hawker Fury and the Gloster Gladiator. Its design influenced future engine developments and contributed to the advancement of aviation technology. The Kestrel played a significant role in the evolution of aircraft engines in the early 20th century.