Radial Engine

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Airplanes are powered by star-shaped engines called radial engines, which have cylinders spreading out like a wheel's spokes from a central hub resembling the crankcase. Also known as star engines, these motors bear various names across languages: German calls them Sternmotors, while the French term is moteur en étoile; the Japanese use hoshigata enjin and the Italians say motore stellare. Once widely employed for aircraft propulsion until gas turbine power surged ahead.