Radial engine

The radial engine is a reciprocating type internal combustion engine configuration in which the cylinders "radiate" outward from a central crankcase like the spokes of a wheel. It resembles a stylized star when viewed from the front, and is called a "star engine" in some other languages.

This article is about the conventional radial engine with fixed cylinders and a revolving crankshaft. For the otherwise similar engine with a rotating crankcase, see rotary engine.

The radial configuration was commonly used for aircraft engines before gas turbine engines became predominant.

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