The Gipsy Major is a four-cylinder, air-cooled aircraft engine designed by Gipsy Motors in the 1930s. It is known for its reliability and simplicity, making it a popular choice for light aircraft. The engine typically produces around 130 horsepower and has been used in various aircraft, including the de Havilland Tiger Moth. This engine features a direct-drive configuration and is often praised for its ease of maintenance. The Gipsy Major has powered numerous vintage and training aircraft, contributing to its reputation in the aviation community. Its design has influenced many subsequent aircraft engines in the general aviation sector.