Pilot and engineer who designed and produced many models of German fighter planes during the World War I years.
One of his earliest and best known inventions involved the synchronization of machine guns and propeller blades.
He designed the Dr.1 Dreidecker monoplane that was flown by Germany's famous Red Baron, Manfred von Richtofen.
His father owned a Dutch plantation in present-day Indonesia (which was then known as the Dutch East Indies).
He worked with fellow engineer Hugo Junkers on several airplane models.