Junkers L5

The Junkers L 5 was a six-cylinder, water-cooled, inline aircraft engine built in Germany during the 1920s, a much enlarged development of the L2 with four times the swept volume, nearly 23 litres. It was a four-stroke, petrol-fuelled upright unit with twin inlet and exhaust valves per cylinder driven by an overhead camshaft, twin spark plugs and twin magnetos, and it drove the propeller directly. The L5 proved reliable and became the engine of choice for most Junkers aircraft of the mid-1920s, including the F.13 and derivatives such as the W 33. A L5 powered the single-engined W 33 Bremen on the first east to west fixed-wing crossing of the Atlantic in April 1928. The V12 L55 was built from two L5s, and the geared L8 was a 1929 development.