Radial engine

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An aircraft's radial engine is a type of internal combustion engine that has its pistons arranged in a circle around the crankshaft, thus giving it the name "radial". This design was popular during the early to mid-20th century and was particularly well-suited for use in airplanes due to its compact size and high power output. Notable examples of radial engines include those used in the famous DC-3 aircraft and in some World War II fighter planes.