The Le Rhône rotary engine was a type of aircraft engine developed in the early 20th century, primarily used during World War I. It featured a unique design where the cylinders rotated around a fixed crankshaft, providing a high power-to-weight ratio. This made it popular among fighter planes of the era, contributing to its effectiveness in aerial combat. The engine typically had a 9-cylinder configuration and was known for its reliability and simplicity. It was produced by the Le Rhône company in France and powered several notable aircraft, including the Sopwith Camel and Nieuport 11, helping to shape early aviation history.