Aurel Persu (1890–1977) was a Romanian engineer, and the first to apply aerodynamics principles to automobiles. He came to the conclusion that the perfectly aerodynamic automobile has the shape of a falling water-drop.
Persu implemented his idea in 1922–1923 in Berlin, building an automobile that could reach very high speeds for that time, and it could take curves at up to 60 km/h. It was the first car to have the wheels inside its aerodynamic line, which we take for granted today. The car ran for 120,000 km and can be seen since 1961 in the "Dimitrie Leonida" Technical Museum [1] in Bucharest. The car has wrong wheels, and is in rather poor shape.