Otto Zadnik became 1887 bornly into Mondsee. He still moved to his later hometown Bregenz in his childhood.

After an academic degree Zadnik 1912 joined the test division of Austro Daimler AG in Viennese Neustadt. "Porsche's electrician became and it remained the electrician Zadnik over the track street trains "of the Austro-Daimler territorial army, the C trains up to the tank "mouse"".

Otto Zadnik dealt at Austro Daimler with aircraft engine development before the first World War and designed a new one in 1912, for aircraft engine with two air-cooled opposed cylinder engines this one looked like it with 120 mm of piston stroke and 220 mm of drilling like later Volkswagen engines.

Zadnik met late to the Porsche central caucus. His area of responsibility concerned the development of gasoline electrical propulsion systems and turbine drive in the second World War for tank types. It was responsible to Zadnik in cooperation with Siemens for the complicated electrical plant for the legendary "mouse", the 185 tons heavy tank.

After the war went Zadnik to England and designed jet engines for airplanes.

He worked on the development of an Elektro-Volkswagens which could far drive arround 100 km by means of battery boost by braking energy without reloading.

Zadnik patented Porschedevelopemtes to heating and ventilation, electric power transmission, ventilates encapsulated collector machines, loading up proceedings for storage batteries of electrical plants of wind prime movers.