In 1956, Wilhelm Herz rode the 500cc, supercharged, double overhead cam, V-twin, NSU Delphin III streamliner motorcycle to 211.4 miles per hour (340.2 km/h) at Bonneville Speedway in Utah, to break 200 mph (320 km/h) for the first time.
Its fairing, designed in a wind tunnel at University of Stuttgart (then Stuttgart Technical College), gave it a drag coefficient of 0.19. The engine used an unusual rotary supercharger related to NSU’s eventual development of the Wankel engine. In the supercharger, both a trochoidal inner rotor and epitrochoidal outer rotor spun around a stationary shaft.
