A radial engine is an internal combustion engine with a radial bank of cylinders and pistons. It is common on vintage aircraft.
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radial engine on propeller plane
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BMW 132 9-cylinder Radial Engine, Master Connecting Rod and Articulated Rods
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Animations[edit]
Animated Radial engine with cut-away housing, 169Kb
Color animated Radial engine, 752Kb