Junkers Jumo 223
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The Junkers Jumo 223 was an experimental 24-cylinder aircraft engine based on the Junkers Jumo 205. It had four banks of six cylinders in a rhomboid configuration, with four crankshafts one at each vertex of the rhombus, and 48 pistons.
Only one example is known to have been built. It is rumoured to have been taken to Moscow after the war, where development may have continued.
The Jumo 223 was in some ways the predecessor of the successful three-crankshaft Napier Deltic engine.