Fritz Adam Hermann von Opel, before 1918 Opel (4 May 1899, Rüsselsheim, Grand Duchy of Hesse - 8 April 1971), was the only child of Wilhelm von Opel and a grandson of Adam Opel, founder of the Opel company. He is remembered mostly for his spectacular demonstrations of rocket propulsion that earned him the nickname "Rocket Fritz".Opel was born in Rüsselsheim and educated at the technical university of Darmstadt.