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Rumpler tropfenwagen taxi

The Rumpler Tropfenwagen ("Rumpler drop car", named after its shape) was a car developed by Austrian engineer Edmund Rumpler.

Rumpler, born in Vienna, was known as a designer of aircraft when at the 1921 Berlin car show he introduced the Tropfenwagen. It was to be the first streamlined car (beating the American Chrysler Airflow and Czech Tatra T77). The Rumpler had a drag coefficient of only 0.28, a measurement which astonished later engineers and would be competitive even today. The Fiat Balilla of the mid-1930s, by contrast, was rated at 0.60.

The car featured a Siemens and Halske-built[3] 2,580 cc (157 cu in) overhead valve W6 engine, with three banks of paired cylinders, all working on a common crankshaft.[3][4] Producing 36 hp (27 kW),[3] it was mounted just ahead of the rear axle.[5] The engine, transmission, and final drive were assembled together and installed as a unit. The rear swing axles were suspended by trailing leaf springs, while the front beam axle was suspended by leading leaf springs.

Although the car was very advanced for its time, it sold poorly—about 100 cars were built. Small problems at the start (cooling, steering), the appearance of the vehicle, and the absence of a luggage compartment hindered sales. Most were sold as taxis, where easy boarding and the high ceiling were advantages. The last cars were built in 1925.

The Tropfenwagen did become famous, thanks to the film "Metropolis", in which Rumplers found a burning end. It also inspired Mercedes-Benz 130H and 150H road cars.

Only two examples are known to survive, one in the Deutsches Museum's Verkehrszentrum in Munich and one in the Deutsches Technikmuseum Berlin.

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