and decided to apply them for the prospective car. First prototype The initial proposal of the concept was presented by Tatra designer Erich Übelacker, who previously worked on the Tatra 57 car. However, at the time Übelacker's proposal was strongly criticised by Ledwinka. When he was facing the prospect of leaving the company, he finally presented the project with aerodynamic car body with a teardrop rear, which would be used to accommodate the whole drive-line of the car. Paul Jaray, the noted Zeppelin designer, produced a prototype aerodynamic body for the Tatra 57. Übelacker was a mercurial young engineer with great imagination and a lot of enthusiasm - however he lacked the perseverance needed to bring his ideas to fruition, and that is when Ledwinka stepped in to finish the work which might otherwise have come to nothing. The new design was initially tried under a body which was not aerodynamic (the first V570 prototype). Two pieces of the first V570 were made in 1931. Second prototype The work on the second prototype's aerodynamic body started. The second prototype was based on patents using streamlining principles of Paul Jaray. It was very similar to the first prototype, but this time it was equipped with an aerodynamic body. The lower part was following the lines of an aeroplane wing, while the upper part was supposed to be like a second wing added on top. The rear mudguards were incorporated into the body and the rear wheels were covered. The remnants of front mudguards became part of the front bonnet. The running boards were abandoned and accessories (i.e. door handles) were recessed into the body. The floor was flat and enclosed. The front window was inclined at a 45° angle. The positioning of the engine at the rear and its cooling became a difficult task, which is demonstrated by the large number of patents considering the airflow to the rear engine compartment which Tatra registered at the time. The initial prototype had an engine derived from the Tatra 57 two-seater. The final design had four seats. The engine was a two-cylinder air-cooled boxer 854 cc with a power rating of 18 HP at 3500 RPM. The engine, gear-box and half-axles were of unitary construction. The simple two door body had a timber frame. Although it was made purely to test different design ideas, it had good handling and could easily reach speeds