The Bristol Jupiter is a British aircraft engine developed in the 1930s by Bristol Aeroplane Company. It is a 14-cylinder, two-row radial engine known for its reliability and power. The Jupiter was primarily used in military aircraft, including the Bristol Blenheim and Bristol Beaufort, contributing to the performance of these planes during World War II. This engine features a unique design that allows for efficient cooling and operation at high altitudes. With a maximum output of around 1,000 horsepower, the Bristol Jupiter played a significant role in advancing aviation technology during its time, influencing future engine designs.