Schlör, an engineer for Krauss Maffei of Munich, proposed an ultra-low drag coefficient body as early as 1936. Under Schlör's supervision at the AVA (an Aerodynamic testing institute in Göttingen) a model was built. Subsequent wind tunnel tests yielded an extraordinarily low drag coefficient of 0.113. For a functioning model, a Mercedes-Benz 170H chassis, one of their few rear-engine designs, was used. The aluminum body was built by the Ludewig Brothers of Essen. Subsequent tests of the motorized model showed a slightly higher but still impressive drag coefficient of 0.186.
