Radial Engine

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A Radial engine is an aircraft engine that has its cylinders arranged in a radial pattern around the crankcase, which houses the crankshaft. The pistons are connected to the crankshaft by means of gears or rods, and the engine's cooling air is drawn through the hollow crankcase. Radial engines were widely used in aviation during the 1920s to the 1950s, particularly for large aircraft such as airliners and flying boats.