Rumpler Tropfenwagen
The Rumpler Tropfenwagen ("Rumpler drop car", named after its raindrop shape) was a car developed by Austrian engineer Edmund Rumpler to be streamlined with a very low drag coefficient. Introduced at the Berlin Motor Show in September 1921 when the AVUS opened, the tall underpowered passenger car was neither suitable for speeding runs on the AVUS circuit, nor was there any Reichsautobahn highway or paved Reichsstraße road network yet on which it could, as Grand tourer, make good use of its low drag.