Hans von Ohain

Hans Joachim Pabst von Ohain was a German physicist, and designer of the first operational jet engine. His first design ran in March 1937, and it was one of his engines that powered the worlds first flyable alljet aircraft, the prototype of the Heinkel He 178 in late August 1939. In spite of these early successes, other German designs quickly eclipsed von Ohains, and none of his engine designs entered widespread production or operational use.

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Source: Wikipedia