The De Havilland Gipsy is a series of aircraft engines developed in the 1920s by the British manufacturer De Havilland. Known for their reliability and lightweight design, these engines were primarily used in light aircraft and training planes. The Gipsy series includes several models, with the Gipsy I being the first and the Gipsy Major being one of the most popular variants. The Gipsy engines played a significant role in the development of general aviation and were widely adopted in various aircraft, including the De Havilland Tiger Moth. Their influence extended beyond the UK, as they were used in numerous aircraft around the world, contributing to the growth of civil aviation.