Junkers Jumo 222

The Junkers Jumo 222 was a German high-power multiple-bank in-line piston aircraft engine designed under Ferdinand Brandner of the Junkers Motorenwerke. Design work began in 1937. The engine had six in-line cylinder banks spaced at equal angles around the crankcase, four cylinders to a bank, so that it looked like a radial but was liquid-cooled and worked more like a V engine. The original 222A and B version displaced 46.4 litres and, running at 3,200 rpm, delivered 1,850 kW at takeoff. Its projected performance led many wartime Luftwaffe designs, including the Bomber B program, to be planned around it, but it never matured: fewer than three hundred were built and none left the prototype phase.