Double row radial engine

A radial engine with two rows of cylinders whose pistons are connected to a single crankshaft. The crankshaft of a double-row radial engine has two throws, 180` apart. The master rod for the front row of cylinders attaches to one throw, and the master rod for the rear row of cylinders attaches to the other throw. Most double-row radial engines have either 14 or 18 cylinders.