More photos in this wonderful article by TurboMag, the source for most of the photos. The article itself is brilliant, but is in Romanian.
Persu, a specialist in airplanes aerodynamics and dynamics, implemented his idea in 1922–1923 in Berlin, building an automobile with an incredibly low drag coefficient of 0.28 (same as a modern Porsche Carrera) or even 0.22 (still rare among modern production cars), depending on the source]. This drag coefficient was far better that the 0.8–1.0 common with automobiles used at that time. This allowed for the fuel consumption to decrease[citation needed]. It was the first car to have the wheels inside its aerodynamic line, which we take for granted today. This was Persu’s main innovation compared to the 1921 Rumpler Tropfenwagen (“drop car”) of Austrian engineer Edmund Rumpler. Persu’s design received German patent number 402683 in 1924 and US patent 1648505 in 1927.
The original automobile ran for 120,000 kilometres (75,000 mi). Aurel Persu donated it fully functional in 1961 to the [Dimitrie Leonida Technical Museum in Bucharest] where it has since been on display.
Text shamelessly stolen from Wikipedia.
