A radial engine is a type of internal combustion engine typically used in aircraft and consisting of a centrally located crankshaft and an odd number of cylinders arranged in a circular pattern around the crankshaft. The cylinders are usually arranged in one or more rows and are connected to the crankshaft through a series of connecting rods.

In a radial engine, the pistons move in a radial or circular motion, rather than the up-and-down motion in a typical engine. The crankshaft is stationary and does not rotate, while the cylinders and pistons rotate around it. This design provides a number of advantages, including compact size, a high power-to-weight ratio, and a smooth, vibration-free operation.

Radial engines were widely used in aircraft during the early 20th century, particularly during World War I and World War II. They were eventually replaced by more advanced engine designs, such as the jet engine. However, radial engines are still used in some applications, such as helicopters and vintage aircraft.

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