The Hewland AE75, an inline 3-cylinder aero-engine created for the ARV Super2, had three ignition circuits, one for each cylinder.
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The engine had the typical features of an inline vertical 6-cylinder: aluminum bed, cast iron cylinders, one inlet and one exhaust valve per cylinder controlled by bars and rockers, with the cam-shaft in the bed, and dual ignition by two Bosch magnetos.