Aurel Persu (26 December 1890 – 5 May 1977) was a Romanian engineer and pioneer car designer, the first to place the wheels inside the body of the car as part of his attempt to reach the perfect aerodynamic shape for automobiles. He came to the conclusion that the perfectly aerodynamic automobile must have the shape of a falling water drop.
Patented aerodynamic design
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 not reached by almost any 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 4–5 times in Persu's automobile. 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. Considering the diminished distance between the rear wheels, he gave up the differential system for the transmission of the engine torque. This meant that the car could safely negotiate curves at up to 60 km/h. Persu's design received German patent number 402683 in 1924 and US patent 1648505 in 1927.
Derivative car designs
The original design work of Aurel Persu inspired future iconic American car designs:
Notes and references
- (in Romanian) Aurel Persu. Romanian State Office for Inventions and Trademarks
- ROMANIAN AUTOMOTIVE PREMIERES. Autoturism.rdslink.ro. Retrieved on 28 July 2014.
- Persu, A. (1927) "Streamline power vehicle" U.S. Patent 1,648,505
- The Technical Museum "Dimitrie Leonida" Archived 9 November 2005 at the Wayback Machine. Cimec.ro.